Code refactoring (add autoloader and change files organization)

app/check_setup.php

@@ -0,0 +1,40 @@
+<?php
+
+// PHP 5.3.3 minimum
+if (version_compare(PHP_VERSION, '5.3.3', '<')) {
+    die('This software require PHP 5.3.3 minimum');
+}
+
+// Checks for PHP < 5.4
+if (version_compare(PHP_VERSION, '5.4.0', '<')) {
+
+    // Short tags must be enabled for PHP < 5.4
+    if (! ini_get('short_open_tag')) {
+        die('This software require to have short tags enabled if you have PHP < 5.4 ("short_open_tag = On")');
+    }
+
+    // Magic quotes are deprecated since PHP 5.4
+    if (get_magic_quotes_gpc()) {
+        die('This software require to have "Magic quotes" disabled, it\'s deprecated since PHP 5.4 ("magic_quotes_gpc = Off")');
+    }
+}
+
+// Check extension: PDO
+if (! extension_loaded('pdo_sqlite') && ! extension_loaded('pdo_mysql')) {
+    die('PHP extension required: pdo_sqlite or pdo_mysql');
+}
+
+// Check extension: mbstring
+if (! extension_loaded('mbstring')) {
+    die('PHP extension required: mbstring');
+}
+
+// Check if /data is writeable
+if (! is_writable('data')) {
+    die('The directory "data" must be writeable by your web server user');
+}
+
+// Include password_compat for PHP < 5.5
+if (version_compare(PHP_VERSION, '5.5.0', '<')) {
+    require __DIR__.'/../vendor/password.php';
+}