diff --git a/atrium/functions.php b/atrium/functions.php
index 12a2f5624f..d6387010c8 100644
--- a/atrium/functions.php
+++ b/atrium/functions.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Atrium functions and definitions
diff --git a/atrium/patterns/404.php b/atrium/patterns/404.php
index e8c3e74377..80779d12d2 100644
--- a/atrium/patterns/404.php
+++ b/atrium/patterns/404.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Title: 404
diff --git a/atrium/patterns/archive.php b/atrium/patterns/archive.php
index 605ef1aba8..70a1e0a64c 100644
--- a/atrium/patterns/archive.php
+++ b/atrium/patterns/archive.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Title: archive
diff --git a/atrium/patterns/comments.php b/atrium/patterns/comments.php
index 4ad7674318..029f938cb9 100644
--- a/atrium/patterns/comments.php
+++ b/atrium/patterns/comments.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Title: Comments
diff --git a/atrium/patterns/footer-minimal.php b/atrium/patterns/footer-minimal.php
index 7898044edb..4ebc1668d7 100644
--- a/atrium/patterns/footer-minimal.php
+++ b/atrium/patterns/footer-minimal.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Title: footer-minimal
diff --git a/atrium/patterns/footer.php b/atrium/patterns/footer.php
index 29ae8a2a35..e935a28696 100644
--- a/atrium/patterns/footer.php
+++ b/atrium/patterns/footer.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Title: footer
diff --git a/atrium/patterns/header.php b/atrium/patterns/header.php
index 49a96719f8..f1c7264d46 100644
--- a/atrium/patterns/header.php
+++ b/atrium/patterns/header.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Title: header
diff --git a/atrium/patterns/hidden-no-results-content.php b/atrium/patterns/hidden-no-results-content.php
index b3b2cfeb26..1e389ad12e 100644
--- a/atrium/patterns/hidden-no-results-content.php
+++ b/atrium/patterns/hidden-no-results-content.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Title: Hidden No Results Content
diff --git a/atrium/patterns/home.php b/atrium/patterns/home.php
index 4ef1fce0b5..31050510ff 100644
--- a/atrium/patterns/home.php
+++ b/atrium/patterns/home.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Title: home
diff --git a/atrium/patterns/index.php b/atrium/patterns/index.php
index e79b5c6311..99c1aa32e5 100644
--- a/atrium/patterns/index.php
+++ b/atrium/patterns/index.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Title: index
diff --git a/atrium/patterns/page-collection.php b/atrium/patterns/page-collection.php
index dd376c6048..18b1cefa4b 100644
--- a/atrium/patterns/page-collection.php
+++ b/atrium/patterns/page-collection.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Title: page-collection
diff --git a/atrium/patterns/page-exhibitions.php b/atrium/patterns/page-exhibitions.php
index 4e46426626..f5152cd46b 100644
--- a/atrium/patterns/page-exhibitions.php
+++ b/atrium/patterns/page-exhibitions.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Title: page-exhibitions
diff --git a/atrium/patterns/page.php b/atrium/patterns/page.php
index 5df54a021c..a9ad4e1429 100644
--- a/atrium/patterns/page.php
+++ b/atrium/patterns/page.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Title: page
diff --git a/atrium/patterns/search.php b/atrium/patterns/search.php
index 1d474d434e..92d3c12ccd 100644
--- a/atrium/patterns/search.php
+++ b/atrium/patterns/search.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Title: search
diff --git a/balasana/functions.php b/balasana/functions.php
old mode 100755
new mode 100644
index 3deeec9c69..2ab162b0a6
--- a/balasana/functions.php
+++ b/balasana/functions.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Child Theme Functions and definitions
diff --git a/balasana/inc/wpcom-colors.php b/balasana/inc/wpcom-colors.php
index 065717c68d..8788d20517 100644
--- a/balasana/inc/wpcom-colors.php
+++ b/balasana/inc/wpcom-colors.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /* Custom Colors: Balasana */
 
diff --git a/balasana/inc/wpcom-editor-colors.php b/balasana/inc/wpcom-editor-colors.php
index ed4c1bffe4..dc361fc3ff 100644
--- a/balasana/inc/wpcom-editor-colors.php
+++ b/balasana/inc/wpcom-editor-colors.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /*
  * Custom Editor Colors: Balasana
diff --git a/balasana/inc/wpcom.php b/balasana/inc/wpcom.php
index 793295b876..2aa50f741a 100644
--- a/balasana/inc/wpcom.php
+++ b/balasana/inc/wpcom.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?
 /**
  * Adds support for wp.com-specific theme functions.
diff --git a/balasana/template-parts/footer/footer-content.php b/balasana/template-parts/footer/footer-content.php
index 8fd5230eeb..ed75766889 100644
--- a/balasana/template-parts/footer/footer-content.php
+++ b/balasana/template-parts/footer/footer-content.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <footer id="colophon" class="site-footer responsive-max-width">
 	<?php
 	if ( class_exists( 'A8C\FSE\WP_Template' ) ) : // If the FSE plugin is active, use the Header template for content.
diff --git a/balasana/template-parts/header/fse-header.php b/balasana/template-parts/header/fse-header.php
index 2afefe7576..0678ec2731 100644
--- a/balasana/template-parts/header/fse-header.php
+++ b/balasana/template-parts/header/fse-header.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <header id="masthead" class="site-header responsive-max-width">
 	<?php
 		$template = new A8C\FSE\WP_Template();
diff --git a/balasana/template-parts/header/header-content.php b/balasana/template-parts/header/header-content.php
index 96c6c6e938..cdb4a03861 100644
--- a/balasana/template-parts/header/header-content.php
+++ b/balasana/template-parts/header/header-content.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <header id="masthead" class="site-header responsive-max-width">
 	<?php get_template_part( 'template-parts/header/site', 'branding' ); ?>
 	<?php get_template_part( 'template-parts/header/site', 'navigation' ); ?>
diff --git a/balasana/template-parts/header/site-navigation.php b/balasana/template-parts/header/site-navigation.php
index 3eb6e9687d..9805778d31 100644
--- a/balasana/template-parts/header/site-navigation.php
+++ b/balasana/template-parts/header/site-navigation.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php if ( has_nav_menu( 'menu-1' ) ) : ?>
 	<nav id="site-navigation" class="main-navigation" aria-label="<?php esc_attr_e( 'Main Navigation', 'balasana' ); ?>">
 		<input type="checkbox" role="button" aria-haspopup="true" id="toggle" class="hide-visually">
diff --git a/barnsbury/functions.php b/barnsbury/functions.php
old mode 100755
new mode 100644
index f16e5d147c..0aedb8a1a6
--- a/barnsbury/functions.php
+++ b/barnsbury/functions.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Child Theme Functions and definitions
diff --git a/barnsbury/inc/wpcom-colors.php b/barnsbury/inc/wpcom-colors.php
index 9232f588f9..76d35a9062 100644
--- a/barnsbury/inc/wpcom-colors.php
+++ b/barnsbury/inc/wpcom-colors.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /* Custom Colors: Barnsbury */
 
diff --git a/barnsbury/inc/wpcom-editor-colors.php b/barnsbury/inc/wpcom-editor-colors.php
index 922df3dfda..d725e4fe55 100644
--- a/barnsbury/inc/wpcom-editor-colors.php
+++ b/barnsbury/inc/wpcom-editor-colors.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /*
  * Custom Editor Colors: Barnsbury
diff --git a/barnsbury/inc/wpcom.php b/barnsbury/inc/wpcom.php
index b9a79ec186..38d8346c4e 100644
--- a/barnsbury/inc/wpcom.php
+++ b/barnsbury/inc/wpcom.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?
 /**
  * Adds support for wp.com-specific theme functions.
diff --git a/barnsbury/template-parts/header/site-branding.php b/barnsbury/template-parts/header/site-branding.php
index cd3918df29..0abce45b6b 100644
--- a/barnsbury/template-parts/header/site-branding.php
+++ b/barnsbury/template-parts/header/site-branding.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Displays header site branding
diff --git a/brompton/functions.php b/brompton/functions.php
old mode 100755
new mode 100644
index a49311a2d1..a78b3a77ff
--- a/brompton/functions.php
+++ b/brompton/functions.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Child Theme Functions and definitions
diff --git a/brompton/inc/wpcom-colors.php b/brompton/inc/wpcom-colors.php
index 8a9bc4600d..d9b22a6a2f 100644
--- a/brompton/inc/wpcom-colors.php
+++ b/brompton/inc/wpcom-colors.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /* Custom Colors: Brompton */
 
diff --git a/brompton/inc/wpcom-editor-colors.php b/brompton/inc/wpcom-editor-colors.php
index ec53985fa1..c1420cb0c4 100644
--- a/brompton/inc/wpcom-editor-colors.php
+++ b/brompton/inc/wpcom-editor-colors.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /*
  * Custom Editor Colors: Brompton
diff --git a/brompton/inc/wpcom.php b/brompton/inc/wpcom.php
index 24ccba81f1..3491dea78a 100644
--- a/brompton/inc/wpcom.php
+++ b/brompton/inc/wpcom.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?
 /**
  * Adds support for wp.com-specific theme functions.
diff --git a/brompton/template-parts/footer/footer-content.php b/brompton/template-parts/footer/footer-content.php
index 7182cf5ca8..7e7ecd1a14 100644
--- a/brompton/template-parts/footer/footer-content.php
+++ b/brompton/template-parts/footer/footer-content.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php if ( class_exists( 'A8C\FSE\WP_Template' ) ) : // If the FSE plugin is active, use the Header template for content. ?>
 	<footer class="fse-template-part fse-footer entry-content">
 		<?php
diff --git a/calm-business/functions.php b/calm-business/functions.php
index 52c97d1d58..55c0945b9a 100644
--- a/calm-business/functions.php
+++ b/calm-business/functions.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Calm (Twenty Nineteen) functions and definitions.
diff --git a/calm-business/inc/customizer.php b/calm-business/inc/customizer.php
index db93585214..118131846c 100644
--- a/calm-business/inc/customizer.php
+++ b/calm-business/inc/customizer.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Change the label of the Site Title option.
diff --git a/calm-business/inc/jetpack.php b/calm-business/inc/jetpack.php
index f5d6b1839a..acedf98bdd 100644
--- a/calm-business/inc/jetpack.php
+++ b/calm-business/inc/jetpack.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Jetpack Compatibility File.
diff --git a/calm-business/inc/wpcom.php b/calm-business/inc/wpcom.php
index e41f632351..6462bc535a 100644
--- a/calm-business/inc/wpcom.php
+++ b/calm-business/inc/wpcom.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * WPcom Compatibility File.
diff --git a/coutoire/functions.php b/coutoire/functions.php
old mode 100755
new mode 100644
index 1ca6c6f6b5..429c65c612
--- a/coutoire/functions.php
+++ b/coutoire/functions.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Child Theme Functions and definitions
diff --git a/coutoire/inc/wpcom-colors.php b/coutoire/inc/wpcom-colors.php
index 06683f11b8..cffe3bb9cc 100644
--- a/coutoire/inc/wpcom-colors.php
+++ b/coutoire/inc/wpcom-colors.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /* Custom Colors: Coutoire */
 
diff --git a/coutoire/inc/wpcom-editor-colors.php b/coutoire/inc/wpcom-editor-colors.php
index a384529e39..635b9ffade 100644
--- a/coutoire/inc/wpcom-editor-colors.php
+++ b/coutoire/inc/wpcom-editor-colors.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /*
  * Custom Editor Colors
diff --git a/coutoire/inc/wpcom.php b/coutoire/inc/wpcom.php
index a8a1da5bbd..6135b66809 100644
--- a/coutoire/inc/wpcom.php
+++ b/coutoire/inc/wpcom.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?
 /**
  * Adds support for wp.com-specific theme functions.
diff --git a/coutoire/template-parts/header/header-content.php b/coutoire/template-parts/header/header-content.php
index 3ff654bb7f..8ddf5b6372 100644
--- a/coutoire/template-parts/header/header-content.php
+++ b/coutoire/template-parts/header/header-content.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <header id="masthead" class="site-header alignfull">
 	<?php get_template_part( 'template-parts/header/site', 'branding' ); ?>
 	<?php get_template_part( 'template-parts/header/site', 'navigation' ); ?>
diff --git a/dalston/functions.php b/dalston/functions.php
old mode 100755
new mode 100644
index 71081b1de0..ffbe572753
--- a/dalston/functions.php
+++ b/dalston/functions.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Child Theme Functions and definitions
diff --git a/dalston/inc/wpcom-colors.php b/dalston/inc/wpcom-colors.php
index 4b90fd0df6..9431d69cee 100644
--- a/dalston/inc/wpcom-colors.php
+++ b/dalston/inc/wpcom-colors.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /* Custom Colors: Dalston */
 
diff --git a/dalston/inc/wpcom-editor-colors.php b/dalston/inc/wpcom-editor-colors.php
index f0f62e870c..993c7d799e 100644
--- a/dalston/inc/wpcom-editor-colors.php
+++ b/dalston/inc/wpcom-editor-colors.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /*
  * Custom Editor Colors
diff --git a/dalston/inc/wpcom.php b/dalston/inc/wpcom.php
index 7eb6637a1c..2aa7686009 100644
--- a/dalston/inc/wpcom.php
+++ b/dalston/inc/wpcom.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?
 /**
  * Adds support for wp.com-specific theme functions.
diff --git a/dalston/template-parts/footer/footer-content.php b/dalston/template-parts/footer/footer-content.php
index 7861b042c4..a1d1ad2983 100644
--- a/dalston/template-parts/footer/footer-content.php
+++ b/dalston/template-parts/footer/footer-content.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php if ( class_exists( 'A8C\FSE\WP_Template' ) ) : // If the FSE plugin is active, use the Header template for content. ?>
 	<footer class="fse-template-part fse-footer entry-content">
 		<?php
diff --git a/dalston/template-parts/header/fse-header.php b/dalston/template-parts/header/fse-header.php
index 37c6df43ba..134780e57b 100644
--- a/dalston/template-parts/header/fse-header.php
+++ b/dalston/template-parts/header/fse-header.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <header id="masthead" class="site-header site-branding entry-content">
 	<?php
 		$template = new A8C\FSE\WP_Template();
diff --git a/dalston/template-parts/header/header-content.php b/dalston/template-parts/header/header-content.php
index 9196623801..361795c334 100644
--- a/dalston/template-parts/header/header-content.php
+++ b/dalston/template-parts/header/header-content.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 $has_primary_nav = has_nav_menu( 'menu-1' );
 $header_classes  = 'site-header';
diff --git a/dalston/template-parts/header/site-branding.php b/dalston/template-parts/header/site-branding.php
index 41e8613e8c..45206cefd4 100644
--- a/dalston/template-parts/header/site-branding.php
+++ b/dalston/template-parts/header/site-branding.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Displays header site branding
diff --git a/elegant-business/functions.php b/elegant-business/functions.php
index d10307cc54..ed5c553a35 100644
--- a/elegant-business/functions.php
+++ b/elegant-business/functions.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Elegant Business functions and definitions.
diff --git a/elegant-business/inc/customizer.php b/elegant-business/inc/customizer.php
index 4a1dedcfb3..2f4b6f12a3 100644
--- a/elegant-business/inc/customizer.php
+++ b/elegant-business/inc/customizer.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Custom functions that act independently of the theme templates.
diff --git a/elegant-business/inc/extras.php b/elegant-business/inc/extras.php
index f432b70628..400be3721c 100644
--- a/elegant-business/inc/extras.php
+++ b/elegant-business/inc/extras.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Custom functions that act independently of the theme templates.
diff --git a/elegant-business/inc/jetpack.php b/elegant-business/inc/jetpack.php
index d7179505f2..a7aa47778f 100644
--- a/elegant-business/inc/jetpack.php
+++ b/elegant-business/inc/jetpack.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Jetpack Compatibility File.
diff --git a/elegant-business/inc/wpcom.php b/elegant-business/inc/wpcom.php
index 61d3ca7d23..d4567d00d8 100644
--- a/elegant-business/inc/wpcom.php
+++ b/elegant-business/inc/wpcom.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * WordPress.com-specific functions and definitions.
diff --git a/exford/functions.php b/exford/functions.php
old mode 100755
new mode 100644
index 617fac024b..511b35236c
--- a/exford/functions.php
+++ b/exford/functions.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Child Theme Functions and definitions
diff --git a/exford/inc/wpcom-colors.php b/exford/inc/wpcom-colors.php
index 62a4af6e83..4a590a6a61 100644
--- a/exford/inc/wpcom-colors.php
+++ b/exford/inc/wpcom-colors.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /* Custom Colors: Exford */
 
diff --git a/exford/inc/wpcom-editor-colors.php b/exford/inc/wpcom-editor-colors.php
index 54e5548217..44bfde3d28 100644
--- a/exford/inc/wpcom-editor-colors.php
+++ b/exford/inc/wpcom-editor-colors.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /*
  * Custom Editor Colors
diff --git a/exford/inc/wpcom.php b/exford/inc/wpcom.php
index 7b59b0cd84..75b0923636 100644
--- a/exford/inc/wpcom.php
+++ b/exford/inc/wpcom.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?
 /**
  * Adds support for wp.com-specific theme functions.
diff --git a/friendly-business/functions.php b/friendly-business/functions.php
index fd0bbdcb30..4f1c3d1c9e 100644
--- a/friendly-business/functions.php
+++ b/friendly-business/functions.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Friendly Business functions and definitions.
diff --git a/friendly-business/inc/customizer.php b/friendly-business/inc/customizer.php
index 728d8a577b..7afdb6740c 100644
--- a/friendly-business/inc/customizer.php
+++ b/friendly-business/inc/customizer.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Friendly Business: Customizer
diff --git a/friendly-business/inc/jetpack.php b/friendly-business/inc/jetpack.php
index 478d91dea4..77ca4bc74f 100644
--- a/friendly-business/inc/jetpack.php
+++ b/friendly-business/inc/jetpack.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Jetpack Compatibility File.
diff --git a/hever/functions.php b/hever/functions.php
index b2bf073c6c..b6824c9aa2 100644
--- a/hever/functions.php
+++ b/hever/functions.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Child Theme Functions and definitions
diff --git a/hever/inc/wpcom-editor-colors.php b/hever/inc/wpcom-editor-colors.php
index 414071610b..9873e928e9 100644
--- a/hever/inc/wpcom-editor-colors.php
+++ b/hever/inc/wpcom-editor-colors.php
@@ -1,2 +1,3 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 require_once get_template_directory() . '/inc/wpcom-colors-css-variables.php';
diff --git a/hever/inc/wpcom.php b/hever/inc/wpcom.php
index 37ea273f27..e4a46a6d47 100644
--- a/hever/inc/wpcom.php
+++ b/hever/inc/wpcom.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * WordPress.com-specific functions and definitions.
diff --git a/hever/template-parts/header/site-branding.php b/hever/template-parts/header/site-branding.php
index 5fe12ee472..c96344b133 100644
--- a/hever/template-parts/header/site-branding.php
+++ b/hever/template-parts/header/site-branding.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Displays header site branding
diff --git a/hola/functions.php b/hola/functions.php
index 789adbc428..a64acffbbd 100644
--- a/hola/functions.php
+++ b/hola/functions.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * hola functions and definitions
diff --git a/hola/patterns/404.php b/hola/patterns/404.php
index 16a03b7e12..6b48397747 100644
--- a/hola/patterns/404.php
+++ b/hola/patterns/404.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Title: 404
diff --git a/hola/patterns/comments.php b/hola/patterns/comments.php
index cd82175e3b..6cfecf3c14 100644
--- a/hola/patterns/comments.php
+++ b/hola/patterns/comments.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Title: Comments
diff --git a/hola/patterns/footer.php b/hola/patterns/footer.php
index d2970af5f3..ae1bf0341f 100644
--- a/hola/patterns/footer.php
+++ b/hola/patterns/footer.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Title: footer
diff --git a/hola/patterns/header-large.php b/hola/patterns/header-large.php
index b9661b533f..f2764e459a 100644
--- a/hola/patterns/header-large.php
+++ b/hola/patterns/header-large.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Title: header-large
diff --git a/hola/patterns/header-minimal.php b/hola/patterns/header-minimal.php
index 3db875a863..39dbfd81cd 100644
--- a/hola/patterns/header-minimal.php
+++ b/hola/patterns/header-minimal.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Title: header-minimal
diff --git a/hola/patterns/hidden-no-results-content.php b/hola/patterns/hidden-no-results-content.php
index a1f22e7eb2..ab4abe19f0 100644
--- a/hola/patterns/hidden-no-results-content.php
+++ b/hola/patterns/hidden-no-results-content.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Title: Hidden No Results Content
diff --git a/hola/patterns/post-meta.php b/hola/patterns/post-meta.php
index 90f62e8226..78b7dfc42c 100644
--- a/hola/patterns/post-meta.php
+++ b/hola/patterns/post-meta.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Title: post-meta
diff --git a/hola/patterns/single.php b/hola/patterns/single.php
index 83793c3fdb..8f9fca0a69 100644
--- a/hola/patterns/single.php
+++ b/hola/patterns/single.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Title: single
diff --git a/inversum/functions.php b/inversum/functions.php
index 40e63615c0..2697360c09 100644
--- a/inversum/functions.php
+++ b/inversum/functions.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Inversum functions and definitions
diff --git a/inversum/patterns/404.php b/inversum/patterns/404.php
index 8ab9537dd1..d2bb2083fd 100644
--- a/inversum/patterns/404.php
+++ b/inversum/patterns/404.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Title: 404
diff --git a/inversum/patterns/comments.php b/inversum/patterns/comments.php
index c5b372473e..9cdab51775 100644
--- a/inversum/patterns/comments.php
+++ b/inversum/patterns/comments.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Title: Comments
diff --git a/inversum/patterns/footer.php b/inversum/patterns/footer.php
index c695384ca6..fbaad12f52 100644
--- a/inversum/patterns/footer.php
+++ b/inversum/patterns/footer.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Title: footer
diff --git a/inversum/patterns/header.php b/inversum/patterns/header.php
index 2c88f98b38..7504372d18 100644
--- a/inversum/patterns/header.php
+++ b/inversum/patterns/header.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Title: header
diff --git a/inversum/patterns/single.php b/inversum/patterns/single.php
index 006b3aa587..96b1622e3f 100644
--- a/inversum/patterns/single.php
+++ b/inversum/patterns/single.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Title: single
diff --git a/leven/functions.php b/leven/functions.php
old mode 100755
new mode 100644
index 7bee2f1a47..ef88e4411b
--- a/leven/functions.php
+++ b/leven/functions.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Child Theme Functions and definitions
diff --git a/leven/inc/wpcom-colors.php b/leven/inc/wpcom-colors.php
index 72d7ca26c4..eef618318d 100644
--- a/leven/inc/wpcom-colors.php
+++ b/leven/inc/wpcom-colors.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /* Custom Colors: Leven */
 
diff --git a/leven/inc/wpcom-editor-colors.php b/leven/inc/wpcom-editor-colors.php
index 7b95751e46..dec763202f 100644
--- a/leven/inc/wpcom-editor-colors.php
+++ b/leven/inc/wpcom-editor-colors.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /*
  * Custom Editor Colors: Varia
diff --git a/leven/inc/wpcom.php b/leven/inc/wpcom.php
index 6e9d72ad0d..1374b9d50a 100644
--- a/leven/inc/wpcom.php
+++ b/leven/inc/wpcom.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?
 /**
  * Adds support for wp.com-specific theme functions.
diff --git a/leven/template-parts/header/site-branding.php b/leven/template-parts/header/site-branding.php
index 1e15495dd5..b76b47418b 100644
--- a/leven/template-parts/header/site-branding.php
+++ b/leven/template-parts/header/site-branding.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Displays header site branding
diff --git a/mayland/functions.php b/mayland/functions.php
old mode 100755
new mode 100644
index 55f1738c1a..1fecd7c0a7
--- a/mayland/functions.php
+++ b/mayland/functions.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Child Theme Functions and definitions
diff --git a/mayland/inc/wpcom-colors.php b/mayland/inc/wpcom-colors.php
index a41e22977a..d3c61c1215 100644
--- a/mayland/inc/wpcom-colors.php
+++ b/mayland/inc/wpcom-colors.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /* Custom Colors: Mayland */
 
diff --git a/mayland/inc/wpcom-editor-colors.php b/mayland/inc/wpcom-editor-colors.php
index 2522739c9b..77ff55638f 100644
--- a/mayland/inc/wpcom-editor-colors.php
+++ b/mayland/inc/wpcom-editor-colors.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /*
  * Custom Editor Colors
diff --git a/mayland/inc/wpcom.php b/mayland/inc/wpcom.php
index 946be6922a..20f2fdc5d5 100644
--- a/mayland/inc/wpcom.php
+++ b/mayland/inc/wpcom.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?
 /**
  * Adds support for wp.com-specific theme functions.
diff --git a/maywood/functions.php b/maywood/functions.php
old mode 100755
new mode 100644
index 804c928372..8652689e96
--- a/maywood/functions.php
+++ b/maywood/functions.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Child Theme Functions and definitions
diff --git a/maywood/inc/wpcom-colors.php b/maywood/inc/wpcom-colors.php
index 6a1c57fb5d..6517a44a3d 100644
--- a/maywood/inc/wpcom-colors.php
+++ b/maywood/inc/wpcom-colors.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /* Custom Colors: Maywood */
 
diff --git a/maywood/inc/wpcom-editor-colors.php b/maywood/inc/wpcom-editor-colors.php
index b2556bece1..4c67f02458 100644
--- a/maywood/inc/wpcom-editor-colors.php
+++ b/maywood/inc/wpcom-editor-colors.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /*
  * Custom Editor Colors
diff --git a/maywood/inc/wpcom.php b/maywood/inc/wpcom.php
index 27a557baaa..f171f6a4ac 100644
--- a/maywood/inc/wpcom.php
+++ b/maywood/inc/wpcom.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?
 /**
  * Adds support for wp.com-specific theme functions.
diff --git a/modern-business/footer.php b/modern-business/footer.php
index 104c7c1666..0146dc3956 100644
--- a/modern-business/footer.php
+++ b/modern-business/footer.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * The template for displaying the footer
diff --git a/modern-business/functions.php b/modern-business/functions.php
index 490a09c32d..4c59fb8396 100644
--- a/modern-business/functions.php
+++ b/modern-business/functions.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Modern Business functions and definitions
diff --git a/modern-business/header.php b/modern-business/header.php
index fabab00186..a4503ef83d 100644
--- a/modern-business/header.php
+++ b/modern-business/header.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * The header for our theme
diff --git a/modern-business/inc/customizer.php b/modern-business/inc/customizer.php
index 0054d651bc..750ec58cb6 100644
--- a/modern-business/inc/customizer.php
+++ b/modern-business/inc/customizer.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Modern Business: Customizer
diff --git a/modern-business/inc/fse-template-data.php b/modern-business/inc/fse-template-data.php
index 7ab4afb5a2..8c8264fa7f 100644
--- a/modern-business/inc/fse-template-data.php
+++ b/modern-business/inc/fse-template-data.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Template data inserter file.
diff --git a/modern-business/inc/jetpack.php b/modern-business/inc/jetpack.php
index c9590ede3a..dcd60eea82 100644
--- a/modern-business/inc/jetpack.php
+++ b/modern-business/inc/jetpack.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Jetpack Compatibility File.
diff --git a/modern-business/inc/wpcom.php b/modern-business/inc/wpcom.php
index 666c740085..e7aa17540e 100644
--- a/modern-business/inc/wpcom.php
+++ b/modern-business/inc/wpcom.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 
 // Our filter callback function
diff --git a/morden/404.php b/morden/404.php
old mode 100755
new mode 100644
index 88fafbdabf..00438b5f85
--- a/morden/404.php
+++ b/morden/404.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * The template for displaying 404 pages (not found)
diff --git a/morden/archive.php b/morden/archive.php
old mode 100755
new mode 100644
index 7f5206dde6..86ee6113af
--- a/morden/archive.php
+++ b/morden/archive.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * The template for displaying archive pages
diff --git a/morden/functions.php b/morden/functions.php
old mode 100755
new mode 100644
index c749c22ff5..d74a223798
--- a/morden/functions.php
+++ b/morden/functions.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Child Theme Functions and definitions
diff --git a/morden/inc/wpcom-editor-colors.php b/morden/inc/wpcom-editor-colors.php
index 414071610b..9873e928e9 100644
--- a/morden/inc/wpcom-editor-colors.php
+++ b/morden/inc/wpcom-editor-colors.php
@@ -1,2 +1,3 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 require_once get_template_directory() . '/inc/wpcom-colors-css-variables.php';
diff --git a/morden/inc/wpcom.php b/morden/inc/wpcom.php
index fdc4d6bebe..3cb9c1121d 100644
--- a/morden/inc/wpcom.php
+++ b/morden/inc/wpcom.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * WordPress.com-specific functions and definitions.
diff --git a/morden/page.php b/morden/page.php
old mode 100755
new mode 100644
index 13a50ceb7a..312d4c4fc7
--- a/morden/page.php
+++ b/morden/page.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * The template for displaying all single posts
diff --git a/morden/search.php b/morden/search.php
index 966afd136e..1fc1205bdb 100644
--- a/morden/search.php
+++ b/morden/search.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * The template for displaying search results pages
diff --git a/morden/template-parts/content/content-excerpt.php b/morden/template-parts/content/content-excerpt.php
old mode 100755
new mode 100644
index e37bfd5042..6caaec19b5
--- a/morden/template-parts/content/content-excerpt.php
+++ b/morden/template-parts/content/content-excerpt.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Template part for displaying post archives and search results
diff --git a/morden/template-parts/content/content-none.php b/morden/template-parts/content/content-none.php
old mode 100755
new mode 100644
index bdcc5c96b5..e881f0ba98
--- a/morden/template-parts/content/content-none.php
+++ b/morden/template-parts/content/content-none.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Template part for displaying a message that posts cannot be found
diff --git a/morden/template-parts/content/content-page.php b/morden/template-parts/content/content-page.php
old mode 100755
new mode 100644
index 1f78d01285..34a546dc82
--- a/morden/template-parts/content/content-page.php
+++ b/morden/template-parts/content/content-page.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Template part for displaying page content in page.php
diff --git a/morden/template-parts/content/content-single.php b/morden/template-parts/content/content-single.php
old mode 100755
new mode 100644
index 7c9ff2e933..4a4b162ab4
--- a/morden/template-parts/content/content-single.php
+++ b/morden/template-parts/content/content-single.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Template part for displaying posts
diff --git a/morden/template-parts/content/content.php b/morden/template-parts/content/content.php
old mode 100755
new mode 100644
index c6ca4fa253..83ebab4429
--- a/morden/template-parts/content/content.php
+++ b/morden/template-parts/content/content.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Template part for displaying posts
diff --git a/morden/template-parts/header/header-content.php b/morden/template-parts/header/header-content.php
index 4febcf5f0e..9d32ee40f0 100644
--- a/morden/template-parts/header/header-content.php
+++ b/morden/template-parts/header/header-content.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 $has_primary_nav = has_nav_menu( 'menu-1' );
 $header_classes  = 'site-header-wrap responsive-max-width';
diff --git a/morden/template-parts/header/site-branding.php b/morden/template-parts/header/site-branding.php
index 5fe12ee472..c96344b133 100644
--- a/morden/template-parts/header/site-branding.php
+++ b/morden/template-parts/header/site-branding.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Displays header site branding
diff --git a/photos/404.php b/photos/404.php
index e98d9747ff..768aeeccb1 100644
--- a/photos/404.php
+++ b/photos/404.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * The template for displaying 404 pages (not found)
diff --git a/photos/archive.php b/photos/archive.php
index f8b358358a..29df603f7b 100644
--- a/photos/archive.php
+++ b/photos/archive.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * The template for displaying archive pages
diff --git a/photos/comments.php b/photos/comments.php
index 3bfbae82f7..ae0a823193 100644
--- a/photos/comments.php
+++ b/photos/comments.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * The template for displaying comments
diff --git a/photos/footer.php b/photos/footer.php
index b8b79418a1..0879832c9d 100644
--- a/photos/footer.php
+++ b/photos/footer.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * The template for displaying the footer
diff --git a/photos/functions.php b/photos/functions.php
index 498407cec4..7e085608b6 100644
--- a/photos/functions.php
+++ b/photos/functions.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Photos functions and definitions
diff --git a/photos/header.php b/photos/header.php
index 32c7619f08..9fe693bdd5 100644
--- a/photos/header.php
+++ b/photos/header.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * The header for our theme
diff --git a/photos/inc/custom-header.php b/photos/inc/custom-header.php
index fb28e8c23c..f25c72da0d 100644
--- a/photos/inc/custom-header.php
+++ b/photos/inc/custom-header.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Sample implementation of the Custom Header feature
diff --git a/photos/inc/customizer.php b/photos/inc/customizer.php
index 38794e01c2..b0e8d05b39 100644
--- a/photos/inc/customizer.php
+++ b/photos/inc/customizer.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * photos Theme Customizer
diff --git a/photos/inc/icon-functions.php b/photos/inc/icon-functions.php
index 0eaf4e481d..cc4824bcbb 100644
--- a/photos/inc/icon-functions.php
+++ b/photos/inc/icon-functions.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * SVG icons related functions and filters
diff --git a/photos/inc/jetpack-fonts.php b/photos/inc/jetpack-fonts.php
index 2810d8bb69..a729178ac1 100644
--- a/photos/inc/jetpack-fonts.php
+++ b/photos/inc/jetpack-fonts.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 
 add_filter( 'typekit_add_font_category_rules', function( $category_rules ) {
diff --git a/photos/inc/jetpack.php b/photos/inc/jetpack.php
index f61a541e85..a98dcaf299 100644
--- a/photos/inc/jetpack.php
+++ b/photos/inc/jetpack.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Jetpack Compatibility File
diff --git a/photos/inc/logo-resizer.php b/photos/inc/logo-resizer.php
index 2775eda78d..1611488c9e 100644
--- a/photos/inc/logo-resizer.php
+++ b/photos/inc/logo-resizer.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Add Logo Size option in the customizer.
diff --git a/photos/inc/template-functions.php b/photos/inc/template-functions.php
index f82623e5bb..d11095f53a 100644
--- a/photos/inc/template-functions.php
+++ b/photos/inc/template-functions.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Functions which enhance the theme by hooking into WordPress
diff --git a/photos/inc/template-tags.php b/photos/inc/template-tags.php
index c93bf439d3..3e04cff338 100644
--- a/photos/inc/template-tags.php
+++ b/photos/inc/template-tags.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Custom template tags for this theme
diff --git a/photos/inc/wpcom-colors.php b/photos/inc/wpcom-colors.php
index aacb199ea9..01bee26e9c 100644
--- a/photos/inc/wpcom-colors.php
+++ b/photos/inc/wpcom-colors.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /* Custom Colors: Photos */
 
diff --git a/photos/index.php b/photos/index.php
index b450d9922d..df2e5a4d49 100644
--- a/photos/index.php
+++ b/photos/index.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * The main template file
diff --git a/photos/page.php b/photos/page.php
index c51f27ce59..6ba8fb95cb 100644
--- a/photos/page.php
+++ b/photos/page.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * The template for displaying all pages
diff --git a/photos/search.php b/photos/search.php
index f1eeca6e35..9d19db4579 100644
--- a/photos/search.php
+++ b/photos/search.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * The template for displaying search results pages
diff --git a/photos/searchform.php b/photos/searchform.php
index 7dbca375da..325e440dc7 100644
--- a/photos/searchform.php
+++ b/photos/searchform.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Template for displaying search forms in Photos
diff --git a/photos/sidebar.php b/photos/sidebar.php
index ec9f252e29..2c3ebbeba0 100644
--- a/photos/sidebar.php
+++ b/photos/sidebar.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * The sidebar containing the main widget area
diff --git a/photos/single.php b/photos/single.php
index ec062c0529..a9a39a1602 100644
--- a/photos/single.php
+++ b/photos/single.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * The template for displaying all single posts
diff --git a/photos/template-parts/content-grid.php b/photos/template-parts/content-grid.php
index 97fff2a584..6498e47776 100644
--- a/photos/template-parts/content-grid.php
+++ b/photos/template-parts/content-grid.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Template part for displaying grid posts
diff --git a/photos/template-parts/content-none.php b/photos/template-parts/content-none.php
index c2650b7692..0532d7cc3a 100644
--- a/photos/template-parts/content-none.php
+++ b/photos/template-parts/content-none.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Template part for displaying a message that posts cannot be found
diff --git a/photos/template-parts/content-page.php b/photos/template-parts/content-page.php
index 887fd8c447..038820a1b0 100644
--- a/photos/template-parts/content-page.php
+++ b/photos/template-parts/content-page.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Template part for displaying page content in page.php
diff --git a/photos/template-parts/content-search.php b/photos/template-parts/content-search.php
index 8542c02c32..49eee92791 100644
--- a/photos/template-parts/content-search.php
+++ b/photos/template-parts/content-search.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Template part for displaying results in search pages
diff --git a/photos/template-parts/content.php b/photos/template-parts/content.php
index 609f0fe167..fecffcd267 100644
--- a/photos/template-parts/content.php
+++ b/photos/template-parts/content.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Template part for displaying posts
diff --git a/professional-business/functions.php b/professional-business/functions.php
index bb81713f18..0469dbc7ac 100644
--- a/professional-business/functions.php
+++ b/professional-business/functions.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Professional Business (Twenty Nineteen) functions and definitions.
diff --git a/professional-business/inc/customizer.php b/professional-business/inc/customizer.php
index eb21b4dd68..5d3d03bd59 100644
--- a/professional-business/inc/customizer.php
+++ b/professional-business/inc/customizer.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Professional Business: Customizer
diff --git a/professional-business/inc/jetpack.php b/professional-business/inc/jetpack.php
index e4f4fef206..1830b08e87 100644
--- a/professional-business/inc/jetpack.php
+++ b/professional-business/inc/jetpack.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Jetpack Compatibility File.
diff --git a/redhill/functions.php b/redhill/functions.php
old mode 100755
new mode 100644
index 7348a2a360..781a1f7732
--- a/redhill/functions.php
+++ b/redhill/functions.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Child Theme Functions and definitions
diff --git a/redhill/inc/wpcom-colors.php b/redhill/inc/wpcom-colors.php
index fcadc91f4c..f136a3dbf2 100644
--- a/redhill/inc/wpcom-colors.php
+++ b/redhill/inc/wpcom-colors.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /* Custom Colors: Redhill */
 
diff --git a/redhill/inc/wpcom-editor-colors.php b/redhill/inc/wpcom-editor-colors.php
index d0d9f5f1d3..71a65467b9 100644
--- a/redhill/inc/wpcom-editor-colors.php
+++ b/redhill/inc/wpcom-editor-colors.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /*
  * Custom Editor Colors
diff --git a/redhill/inc/wpcom.php b/redhill/inc/wpcom.php
index 730269f958..a7eebf31b1 100644
--- a/redhill/inc/wpcom.php
+++ b/redhill/inc/wpcom.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?
 /**
  * Adds support for wp.com-specific theme functions.
diff --git a/rivington/functions.php b/rivington/functions.php
old mode 100755
new mode 100644
index 3335159299..1e37011f35
--- a/rivington/functions.php
+++ b/rivington/functions.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Child Theme Functions and definitions
diff --git a/rivington/inc/wpcom-colors.php b/rivington/inc/wpcom-colors.php
index 11e3131835..df8ccd4cbe 100644
--- a/rivington/inc/wpcom-colors.php
+++ b/rivington/inc/wpcom-colors.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /* Custom Colors: Rivington */
 
diff --git a/rivington/inc/wpcom-editor-colors.php b/rivington/inc/wpcom-editor-colors.php
index 5b4f80b548..39675f96f6 100644
--- a/rivington/inc/wpcom-editor-colors.php
+++ b/rivington/inc/wpcom-editor-colors.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /*
  * Custom Editor Colors
diff --git a/rivington/inc/wpcom.php b/rivington/inc/wpcom.php
index fe8177be18..52ccab635b 100644
--- a/rivington/inc/wpcom.php
+++ b/rivington/inc/wpcom.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?
 /**
  * Adds support for wp.com-specific theme functions.
diff --git a/rivington/template-parts/footer/footer-content.php b/rivington/template-parts/footer/footer-content.php
index 7224547aa8..e77705f0b8 100644
--- a/rivington/template-parts/footer/footer-content.php
+++ b/rivington/template-parts/footer/footer-content.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <footer id="colophon" class="site-footer responsive-max-width">
 	<?php
 	if ( class_exists( 'A8C\FSE\WP_Template' ) ) : // If the FSE plugin is active, use the Header template for content.
diff --git a/rivington/template-parts/header/header-content.php b/rivington/template-parts/header/header-content.php
index 02ff122c07..1c2d0b16e7 100644
--- a/rivington/template-parts/header/header-content.php
+++ b/rivington/template-parts/header/header-content.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 $has_primary_nav = has_nav_menu( 'menu-1' );
 $header_classes  = 'site-header responsive-max-width';
diff --git a/rivington/template-parts/header/site-navigation.php b/rivington/template-parts/header/site-navigation.php
index 1ddee9c967..a176ae6d93 100644
--- a/rivington/template-parts/header/site-navigation.php
+++ b/rivington/template-parts/header/site-navigation.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php 
 $has_primary_nav = has_nav_menu( 'menu-1' );
 if ( $has_primary_nav ) : ?>
diff --git a/rockfield/functions.php b/rockfield/functions.php
old mode 100755
new mode 100644
index f34e7f490c..530979af58
--- a/rockfield/functions.php
+++ b/rockfield/functions.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Child Theme Functions and definitions
diff --git a/rockfield/inc/wpcom-editor-colors.php b/rockfield/inc/wpcom-editor-colors.php
index 414071610b..9873e928e9 100644
--- a/rockfield/inc/wpcom-editor-colors.php
+++ b/rockfield/inc/wpcom-editor-colors.php
@@ -1,2 +1,3 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 require_once get_template_directory() . '/inc/wpcom-colors-css-variables.php';
diff --git a/rockfield/inc/wpcom.php b/rockfield/inc/wpcom.php
index a94096ad24..4d0eeb3338 100644
--- a/rockfield/inc/wpcom.php
+++ b/rockfield/inc/wpcom.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * WordPress.com-specific functions and definitions.
diff --git a/rockfield/template-parts/footer/footer-content.php b/rockfield/template-parts/footer/footer-content.php
index 438c2c23cd..4d2dfab73a 100644
--- a/rockfield/template-parts/footer/footer-content.php
+++ b/rockfield/template-parts/footer/footer-content.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php if ( class_exists( 'A8C\FSE\WP_Template' ) ) : // If the FSE plugin is active, use the Header template for content. ?>
 	<footer class="fse-template-part fse-footer entry-content">
 	<?php
diff --git a/rockfield/template-parts/header/header-content.php b/rockfield/template-parts/header/header-content.php
index 4dcde643e4..c5f1948b9a 100644
--- a/rockfield/template-parts/header/header-content.php
+++ b/rockfield/template-parts/header/header-content.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <header id="masthead" class="site-header">
 	<?php get_template_part( 'template-parts/header/site', 'branding' ); ?>
 	<?php get_template_part( 'template-parts/header/site', 'navigation' ); ?>
diff --git a/rockfield/template-parts/header/site-navigation.php b/rockfield/template-parts/header/site-navigation.php
index 0fe3bf3403..1488f80b5c 100644
--- a/rockfield/template-parts/header/site-navigation.php
+++ b/rockfield/template-parts/header/site-navigation.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php if ( has_nav_menu( 'menu-1' ) ) : ?>
 	<nav id="site-navigation" class="main-navigation" aria-label="<?php esc_attr_e( 'Main Navigation', 'rockfield' ); ?>">
 		<input type="checkbox" role="button" aria-haspopup="true" id="toggle" class="hide-visually">
diff --git a/seedlet/404.php b/seedlet/404.php
old mode 100755
new mode 100644
index b992a763b1..2cfb05bead
--- a/seedlet/404.php
+++ b/seedlet/404.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * The template for displaying 404 pages (not found)
diff --git a/seedlet/archive.php b/seedlet/archive.php
old mode 100755
new mode 100644
index a8d2f5db0e..372793af1b
--- a/seedlet/archive.php
+++ b/seedlet/archive.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * The template for displaying archive pages
diff --git a/seedlet/classes/class-seedlet-custom-colors.php b/seedlet/classes/class-seedlet-custom-colors.php
index c9c5527cec..d68e2c339d 100644
--- a/seedlet/classes/class-seedlet-custom-colors.php
+++ b/seedlet/classes/class-seedlet-custom-colors.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Seedlet Theme: Custom Colors Class
diff --git a/seedlet/classes/class-seedlet-svg-icons.php b/seedlet/classes/class-seedlet-svg-icons.php
old mode 100755
new mode 100644
index 5e911d509d..2ccc62e0e4
--- a/seedlet/classes/class-seedlet-svg-icons.php
+++ b/seedlet/classes/class-seedlet-svg-icons.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * SVG Icons class
diff --git a/seedlet/comments.php b/seedlet/comments.php
old mode 100755
new mode 100644
index 37f5b83cd3..6558d1a37d
--- a/seedlet/comments.php
+++ b/seedlet/comments.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * The template for displaying comments
diff --git a/seedlet/footer.php b/seedlet/footer.php
old mode 100755
new mode 100644
index b442ab2a1d..83035e716e
--- a/seedlet/footer.php
+++ b/seedlet/footer.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * The template for displaying the footer
diff --git a/seedlet/functions.php b/seedlet/functions.php
old mode 100755
new mode 100644
index f8614bc854..daf23824b9
--- a/seedlet/functions.php
+++ b/seedlet/functions.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Seedlet functions and definitions
diff --git a/seedlet/header.php b/seedlet/header.php
old mode 100755
new mode 100644
index ef220e1a06..c3a978bb1a
--- a/seedlet/header.php
+++ b/seedlet/header.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * The header for our theme
diff --git a/seedlet/image.php b/seedlet/image.php
old mode 100755
new mode 100644
index 87c988d18d..b31f6c3fa1
--- a/seedlet/image.php
+++ b/seedlet/image.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * The template for displaying image attachments
diff --git a/seedlet/inc/back-compat.php b/seedlet/inc/back-compat.php
old mode 100755
new mode 100644
index 15aa733b55..14abc3bf00
--- a/seedlet/inc/back-compat.php
+++ b/seedlet/inc/back-compat.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * seedlet back compat functionality
diff --git a/seedlet/inc/block-patterns.php b/seedlet/inc/block-patterns.php
index 98581aa67f..54253fc4cf 100644
--- a/seedlet/inc/block-patterns.php
+++ b/seedlet/inc/block-patterns.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Seedlet Theme: Block Patterns
diff --git a/seedlet/inc/block-styles.php b/seedlet/inc/block-styles.php
index 11ad9b1b63..6681a02f9f 100644
--- a/seedlet/inc/block-styles.php
+++ b/seedlet/inc/block-styles.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Seedlet Theme: Block Styles
diff --git a/seedlet/inc/customizer.php b/seedlet/inc/customizer.php
old mode 100755
new mode 100644
index 43135f0a6e..9ef0b8e829
--- a/seedlet/inc/customizer.php
+++ b/seedlet/inc/customizer.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Seedlet Theme: Customizer
diff --git a/seedlet/inc/icon-functions.php b/seedlet/inc/icon-functions.php
old mode 100755
new mode 100644
index 35a9ff6e0c..8a0f41e4b1
--- a/seedlet/inc/icon-functions.php
+++ b/seedlet/inc/icon-functions.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * SVG icons related functions
diff --git a/seedlet/inc/jetpack.php b/seedlet/inc/jetpack.php
index 753a8b5413..5b37539d94 100644
--- a/seedlet/inc/jetpack.php
+++ b/seedlet/inc/jetpack.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Jetpack Compatibility File
diff --git a/seedlet/inc/template-functions.php b/seedlet/inc/template-functions.php
old mode 100755
new mode 100644
index a26c84d7ed..ad1dff7b3d
--- a/seedlet/inc/template-functions.php
+++ b/seedlet/inc/template-functions.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Functions which enhance the theme by hooking into WordPress
diff --git a/seedlet/inc/template-tags.php b/seedlet/inc/template-tags.php
old mode 100755
new mode 100644
index d956912431..90ae74b39f
--- a/seedlet/inc/template-tags.php
+++ b/seedlet/inc/template-tags.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Custom template tags for this theme
diff --git a/seedlet/inc/woocommerce.php b/seedlet/inc/woocommerce.php
old mode 100755
new mode 100644
index 08cd19c65f..0025c9a7fb
--- a/seedlet/inc/woocommerce.php
+++ b/seedlet/inc/woocommerce.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * WooCommerce Compatibility File
diff --git a/seedlet/inc/wpcom-colors-utils.php b/seedlet/inc/wpcom-colors-utils.php
index 65903ed849..a7c4e99c01 100644
--- a/seedlet/inc/wpcom-colors-utils.php
+++ b/seedlet/inc/wpcom-colors-utils.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 
 // Custom Colors: Seedlet
diff --git a/seedlet/inc/wpcom-colors.php b/seedlet/inc/wpcom-colors.php
index 0213b65d89..1d7fc035d5 100644
--- a/seedlet/inc/wpcom-colors.php
+++ b/seedlet/inc/wpcom-colors.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 require_once __DIR__ . '/wpcom-colors-utils.php';
 
diff --git a/seedlet/inc/wpcom-editor-colors.php b/seedlet/inc/wpcom-editor-colors.php
index 92073b51a6..5920713481 100644
--- a/seedlet/inc/wpcom-editor-colors.php
+++ b/seedlet/inc/wpcom-editor-colors.php
@@ -1,2 +1,3 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
-require_once 'wpcom-colors.php';
+require_once __DIR__ . 'wpcom-colors.php';
diff --git a/seedlet/inc/wpcom.php b/seedlet/inc/wpcom.php
index 2faea69c20..8d7a57198d 100644
--- a/seedlet/inc/wpcom.php
+++ b/seedlet/inc/wpcom.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * WordPress.com-specific functions and definitions.
diff --git a/seedlet/index.php b/seedlet/index.php
old mode 100755
new mode 100644
index 827e05e9f8..235510aa90
--- a/seedlet/index.php
+++ b/seedlet/index.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * The main template file
diff --git a/seedlet/page.php b/seedlet/page.php
old mode 100755
new mode 100644
index d0f8ca4622..b9cea3ed82
--- a/seedlet/page.php
+++ b/seedlet/page.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * The template for displaying all single posts
diff --git a/seedlet/search.php b/seedlet/search.php
old mode 100755
new mode 100644
index d1dc8169e0..2f9e2d9f42
--- a/seedlet/search.php
+++ b/seedlet/search.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * The template for displaying search results pages
diff --git a/seedlet/single.php b/seedlet/single.php
old mode 100755
new mode 100644
index 3cb5b533f8..87c85366f1
--- a/seedlet/single.php
+++ b/seedlet/single.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * The template for displaying all single posts
diff --git a/seedlet/template-parts/content/content-excerpt.php b/seedlet/template-parts/content/content-excerpt.php
old mode 100755
new mode 100644
index 70ce432702..55e3ad4424
--- a/seedlet/template-parts/content/content-excerpt.php
+++ b/seedlet/template-parts/content/content-excerpt.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Template part for displaying post archives and search results
diff --git a/seedlet/template-parts/content/content-none.php b/seedlet/template-parts/content/content-none.php
old mode 100755
new mode 100644
index befc5ed553..ed81ff8818
--- a/seedlet/template-parts/content/content-none.php
+++ b/seedlet/template-parts/content/content-none.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Template part for displaying a message that posts cannot be found
diff --git a/seedlet/template-parts/content/content-page.php b/seedlet/template-parts/content/content-page.php
old mode 100755
new mode 100644
index 740aec2223..300b714ddb
--- a/seedlet/template-parts/content/content-page.php
+++ b/seedlet/template-parts/content/content-page.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Template part for displaying page content in page.php
diff --git a/seedlet/template-parts/content/content-single.php b/seedlet/template-parts/content/content-single.php
old mode 100755
new mode 100644
index c259211516..7b8fe6b6eb
--- a/seedlet/template-parts/content/content-single.php
+++ b/seedlet/template-parts/content/content-single.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Template part for displaying posts
diff --git a/seedlet/template-parts/content/content.php b/seedlet/template-parts/content/content.php
old mode 100755
new mode 100644
index e9c4966138..174ff903bb
--- a/seedlet/template-parts/content/content.php
+++ b/seedlet/template-parts/content/content.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Template part for displaying posts
diff --git a/seedlet/template-parts/footer/footer-content.php b/seedlet/template-parts/footer/footer-content.php
index 1ca7567197..78e619cbbb 100644
--- a/seedlet/template-parts/footer/footer-content.php
+++ b/seedlet/template-parts/footer/footer-content.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php if ( ! ( true === get_theme_mod( 'hide_site_footer', false ) && is_front_page() && is_page() ) ) : ?>
 	<?php get_template_part( 'template-parts/footer/footer-widgets' ); ?>
 	<?php get_template_part( 'template-parts/footer/footer-menu' ); ?>
diff --git a/seedlet/template-parts/footer/footer-info.php b/seedlet/template-parts/footer/footer-info.php
index 0d8254208c..71aae6f754 100644
--- a/seedlet/template-parts/footer/footer-info.php
+++ b/seedlet/template-parts/footer/footer-info.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <div class="site-info">
 	<?php $blog_info = get_bloginfo( 'name' ); ?>
 	<?php if ( ! empty( $blog_info ) ) : ?>
diff --git a/seedlet/template-parts/footer/footer-menu.php b/seedlet/template-parts/footer/footer-menu.php
index 9f01fae7f7..d0248e3867 100644
--- a/seedlet/template-parts/footer/footer-menu.php
+++ b/seedlet/template-parts/footer/footer-menu.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php if ( has_nav_menu( 'footer' ) ) : ?>
 	<nav class="footer-navigation" role="navigation" aria-label="<?php esc_attr_e( 'Footer Menu', 'seedlet' ); ?>">
 		<?php
diff --git a/seedlet/template-parts/footer/footer-widgets.php b/seedlet/template-parts/footer/footer-widgets.php
old mode 100755
new mode 100644
index 8dbb2f59ae..d6a33c7c98
--- a/seedlet/template-parts/footer/footer-widgets.php
+++ b/seedlet/template-parts/footer/footer-widgets.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Displays the footer widget area
diff --git a/seedlet/template-parts/header/entry-header.php b/seedlet/template-parts/header/entry-header.php
old mode 100755
new mode 100644
index d2a57de63b..6e1f68488b
--- a/seedlet/template-parts/header/entry-header.php
+++ b/seedlet/template-parts/header/entry-header.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Displays the post header
diff --git a/seedlet/template-parts/header/header-content.php b/seedlet/template-parts/header/header-content.php
index b5e8f0c4be..25be99b359 100644
--- a/seedlet/template-parts/header/header-content.php
+++ b/seedlet/template-parts/header/header-content.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 $has_primary_nav = has_nav_menu( 'primary' );
 $header_classes  = 'site-header header_classes';
diff --git a/seedlet/template-parts/header/navigation.php b/seedlet/template-parts/header/navigation.php
index 3d8ec06f26..4cbf29c361 100644
--- a/seedlet/template-parts/header/navigation.php
+++ b/seedlet/template-parts/header/navigation.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 	$has_primary_nav       = has_nav_menu( 'primary' );
 	$has_primary_nav_items = wp_nav_menu(
diff --git a/seedlet/template-parts/header/site-branding.php b/seedlet/template-parts/header/site-branding.php
index f7fcf364ca..b65a9926db 100644
--- a/seedlet/template-parts/header/site-branding.php
+++ b/seedlet/template-parts/header/site-branding.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Displays header site branding
diff --git a/seedlet/template-parts/post/author-bio.php b/seedlet/template-parts/post/author-bio.php
old mode 100755
new mode 100644
index 3d2e6d3dba..25b118613c
--- a/seedlet/template-parts/post/author-bio.php
+++ b/seedlet/template-parts/post/author-bio.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * The template for displaying Author info
diff --git a/shawburn/functions.php b/shawburn/functions.php
old mode 100755
new mode 100644
index 99df29e79d..3b30a19c99
--- a/shawburn/functions.php
+++ b/shawburn/functions.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Child Theme Functions and definitions
diff --git a/shawburn/inc/wpcom-editor-colors.php b/shawburn/inc/wpcom-editor-colors.php
index 414071610b..9873e928e9 100644
--- a/shawburn/inc/wpcom-editor-colors.php
+++ b/shawburn/inc/wpcom-editor-colors.php
@@ -1,2 +1,3 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 require_once get_template_directory() . '/inc/wpcom-colors-css-variables.php';
diff --git a/shawburn/inc/wpcom.php b/shawburn/inc/wpcom.php
index 701001f7b8..83d1f912ab 100644
--- a/shawburn/inc/wpcom.php
+++ b/shawburn/inc/wpcom.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * WordPress.com-specific functions and definitions.
diff --git a/sophisticated-business/functions.php b/sophisticated-business/functions.php
index c2a9075cec..08297a05e6 100644
--- a/sophisticated-business/functions.php
+++ b/sophisticated-business/functions.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Sophisticated Business (Twenty Nineteen) functions and definitions.
diff --git a/sophisticated-business/inc/customizer.php b/sophisticated-business/inc/customizer.php
index 4d698380dd..3546de602a 100644
--- a/sophisticated-business/inc/customizer.php
+++ b/sophisticated-business/inc/customizer.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Sophisticated Business: Customizer
diff --git a/sophisticated-business/inc/jetpack.php b/sophisticated-business/inc/jetpack.php
index 9bf49989d6..1688d2d3fa 100644
--- a/sophisticated-business/inc/jetpack.php
+++ b/sophisticated-business/inc/jetpack.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Jetpack Compatibility File.
diff --git a/stow/functions.php b/stow/functions.php
old mode 100755
new mode 100644
index 387a02e9bb..5be51bfadb
--- a/stow/functions.php
+++ b/stow/functions.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Child Theme Functions and definitions
diff --git a/stow/inc/wpcom-editor-colors.php b/stow/inc/wpcom-editor-colors.php
index 14b39397f7..8cd8cde897 100644
--- a/stow/inc/wpcom-editor-colors.php
+++ b/stow/inc/wpcom-editor-colors.php
@@ -1,2 +1,3 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 require_once get_template_directory() . '/inc/wpcom-colors-css-variables.php';
\ No newline at end of file
diff --git a/stow/inc/wpcom.php b/stow/inc/wpcom.php
index 2c590aff38..b0fa4ada1a 100644
--- a/stow/inc/wpcom.php
+++ b/stow/inc/wpcom.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * WordPress.com-specific functions and definitions.
diff --git a/stow/template-parts/header/header-content.php b/stow/template-parts/header/header-content.php
index 8ed8306750..0b6dcbcaa0 100644
--- a/stow/template-parts/header/header-content.php
+++ b/stow/template-parts/header/header-content.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <header id="masthead" class="site-header">
 	<?php get_template_part( 'template-parts/header/site', 'branding' ); ?>
 	<?php get_template_part( 'template-parts/header/site', 'navigation' ); ?>
diff --git a/stratford/functions.php b/stratford/functions.php
old mode 100755
new mode 100644
index 7bbe5aa807..c36e989eda
--- a/stratford/functions.php
+++ b/stratford/functions.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Child Theme Functions and definitions
diff --git a/stratford/inc/wpcom-editor-colors.php b/stratford/inc/wpcom-editor-colors.php
index 414071610b..9873e928e9 100644
--- a/stratford/inc/wpcom-editor-colors.php
+++ b/stratford/inc/wpcom-editor-colors.php
@@ -1,2 +1,3 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 require_once get_template_directory() . '/inc/wpcom-colors-css-variables.php';
diff --git a/stratford/inc/wpcom.php b/stratford/inc/wpcom.php
index 39c123b934..93354bd436 100644
--- a/stratford/inc/wpcom.php
+++ b/stratford/inc/wpcom.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * WordPress.com-specific functions and definitions.
diff --git a/stratford/template-parts/footer/footer-content.php b/stratford/template-parts/footer/footer-content.php
index 6f5cb77d4d..aeb5d20e11 100644
--- a/stratford/template-parts/footer/footer-content.php
+++ b/stratford/template-parts/footer/footer-content.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php if ( class_exists( 'A8C\FSE\WP_Template' ) ) : // If the FSE plugin is active, use the Header template for content. ?>
 	<footer class="fse-template-part fse-footer entry-content">
 	<?php
diff --git a/stratford/template-parts/footer/privacy-policy.php b/stratford/template-parts/footer/privacy-policy.php
index 89607efdfe..d4eb630213 100644
--- a/stratford/template-parts/footer/privacy-policy.php
+++ b/stratford/template-parts/footer/privacy-policy.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 if ( function_exists( 'the_privacy_policy_link' ) ) {
 	?>
diff --git a/stratford/template-parts/header/header-content.php b/stratford/template-parts/header/header-content.php
index 5e67960bea..fc24bcdfc0 100644
--- a/stratford/template-parts/header/header-content.php
+++ b/stratford/template-parts/header/header-content.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <header id="masthead" class="site-header alignfull">
 	<div class="site-header-wrapper">
 		<?php get_template_part( 'template-parts/header/site', 'branding' ); ?>
diff --git a/vows/patterns/404.php b/vows/patterns/404.php
index cc3028c5fc..547468c78e 100644
--- a/vows/patterns/404.php
+++ b/vows/patterns/404.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Title: 404
diff --git a/vows/patterns/archive.php b/vows/patterns/archive.php
index c8fd69dc08..98bdb2ae39 100644
--- a/vows/patterns/archive.php
+++ b/vows/patterns/archive.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Title: archive
diff --git a/vows/patterns/footer.php b/vows/patterns/footer.php
index f6264f92c5..02e61b71c6 100644
--- a/vows/patterns/footer.php
+++ b/vows/patterns/footer.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Title: footer
diff --git a/vows/patterns/front-page.php b/vows/patterns/front-page.php
index b403ce2059..8ac575fa89 100644
--- a/vows/patterns/front-page.php
+++ b/vows/patterns/front-page.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Title: front-page
diff --git a/vows/patterns/header.php b/vows/patterns/header.php
index 0f1d28a754..aed5d2e045 100644
--- a/vows/patterns/header.php
+++ b/vows/patterns/header.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Title: header
diff --git a/vows/patterns/home.php b/vows/patterns/home.php
index 7583091145..3fc3888545 100644
--- a/vows/patterns/home.php
+++ b/vows/patterns/home.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Title: home
diff --git a/vows/patterns/index.php b/vows/patterns/index.php
index 534501e59c..2af5b1dbc9 100644
--- a/vows/patterns/index.php
+++ b/vows/patterns/index.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Title: index
diff --git a/vows/patterns/page.php b/vows/patterns/page.php
index 0e368bde5c..505d71d407 100644
--- a/vows/patterns/page.php
+++ b/vows/patterns/page.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Title: page
diff --git a/vows/patterns/search.php b/vows/patterns/search.php
index 4c5dc10f07..8bbb8fa99c 100644
--- a/vows/patterns/search.php
+++ b/vows/patterns/search.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Title: search
diff --git a/vows/patterns/single.php b/vows/patterns/single.php
index ebc1bd8660..e28c0dd99d 100644
--- a/vows/patterns/single.php
+++ b/vows/patterns/single.php
@@ -1,3 +1,4 @@
+<?php declare( strict_types = 1 ); ?>
 <?php
 /**
  * Title: single