first and litle more attempt to build architecture of project

src/Database/FindUrl.php

@@ -1,6 +1,6 @@
 <?php
 
-namespace PostgreSQLTutorial;
+namespace Hexlet\Code\Database;
 
 /**
  * Создание в PostgreSQL таблицы из демонстрации PHP

src/Database/GetUrl.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace Hexlet\Code\Database;
+
+use PostgreSQLTutorial\FindUrl;
+
+class GetUrl
+{
+    /**
+     * объект PDO
+     * @var \PDO
+     */
+    private $pdo;
+
+
+    public function __construct($pdo)
+    {
+        $this->pdo = $pdo;
+    }
+
+    public function process()
+    {
+        $sql = 'SELECT *
+                FROM ad
+                ORDER BY created_at DESC';
+        $sth = $this->pdo->prepare($sql);
+        $sth->execute();
+        return $sth->fetchAll();
+    }
+}

src/Database/InsertUrl.php

@@ -2,7 +2,7 @@
 
 namespace Hexlet\Code\Database;
 
-use PostgreSQLTutorial\FindUrl;
+use Hexlet\Code\Database\FindUrl;
 
 class InsertUrl
 {

src/Engine.php

@@ -4,18 +4,19 @@
 
 class Engine
 {
-    private $action;
     private $processor;
     private $value;
 
-    public function __construct($databaseName, $action, $value)
-    {
+    public function __construct(
+        $databaseName,
+        $action,
+        $value = null
+    ) {
         $connectData = "Connect{$databaseName}";
         $actionName = "{$action}{$databaseName}";
         $database = $connectData::get()->connect();
         $processor = new $actionName($database);
         $this->processor = $processor;
-        $this->action = $action;
         $this->value = $value;
     }
 

src/Validate.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace App;
+
+class Validator
+{
+    public function validate(string $url): array
+    {
+        $errors = [];
+        if (strlen($url) > 255) {
+            $errors['strlen'] = "Url must be less than 256 characters";
+        } elseif (!filter_var($url, FILTER_VALIDATE_URL)) {
+            $errors['valid'] = 'URL is not valid';
+        }
+        return $errors;
+    }
+}