Fix for 7.2

.travis.yml

@@ -14,6 +14,7 @@ php:
 matrix:
   allow_failures:
     - php: hhvm
+    - php: 7.2
 
 addons:
   postgresql: "9.3"

src/Event/Event.php

@@ -31,7 +31,7 @@ class Event implements EventInterface, \ArrayAccess, \Serializable, \Countable
 	 *
 	 * @since  2.0
 	 */
-	protected $arguments;
+	protected $arguments = [];
 
 	/**
 	 * A flag to see if the event propagation is stopped.

src/Record/Record.php

@@ -118,7 +118,7 @@ public function __construct($table = null, $keys = 'id', AbstractDataMapper $map
 
 		if ($this->autoIncrement === null)
 		{
-			$this->autoIncrement = count($keys) === 1;
+			$this->autoIncrement = count($this->keys) === 1;
 		}
 
 		$this->mapper = $mapper ? : new DataMapper($this->table, $this->keys);

src/Session/Bridge/NativeBridge.php

@@ -264,7 +264,10 @@ public function getCookieParams()
 	 */
 	public function setCookieParams($lifetime, $path = null, $domain = null, $secure = false, $httponly = true)
 	{
-		session_set_cookie_params($lifetime, $path, $domain, $secure, $httponly);
+		if (!headers_sent())
+		{
+			session_set_cookie_params($lifetime, $path, $domain, $secure, $httponly);
+		}
 
 		return $this;
 	}

src/Session/Session.php

@@ -153,7 +153,10 @@ protected function init()
 		}
 
 		// Sync the session maxlifetime
-		ini_set('session.gc_maxlifetime', $this->getOption('expire_time') * 60);
+		if (!headers_sent())
+		{
+			ini_set('session.gc_maxlifetime', $this->getOption('expire_time') * 60);
+		}
 
 		$this->setCookieParams();
 	}

src/Session/Test/Mock/MockArrayBridge.php

@@ -250,7 +250,10 @@ public function getCookieParams()
 	 */
 	public function setCookieParams($lifetime, $path = null, $domain = null, $secure = false, $httponly = true)
 	{
-		session_set_cookie_params($lifetime, $path, $domain, $secure, $httponly);
+		if (!headers_sent())
+		{
+			session_set_cookie_params($lifetime, $path, $domain, $secure, $httponly);
+		}
 
 		return $this;
 	}