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+<?php
+// +----------------------------------------------------------------------+
+// | PHP Version 4                                                        |
+// +----------------------------------------------------------------------+
+// | Copyright (c) 1997-2004 The PHP Group                                |
+// +----------------------------------------------------------------------+
+// | This source file is subject to version 3.0 of the PHP license,       |
+// | that is bundled with this package in the file LICENSE, and is        |
+// | available at through the world-wide-web at                           |
+// | http://www.php.net/license/3_0.txt.                                  |
+// | If you did not receive a copy of the PHP license and are unable to   |
+// | obtain it through the world-wide-web, please send a note to          |
+// | license@php.net so we can mail you a copy immediately.               |
+// +----------------------------------------------------------------------+
+// | Authors: Aidan Lister <aidan@php.net>                                |
+// +----------------------------------------------------------------------+
+//
+// $Id: array_key_exists.php,v 1.1 2005/07/11 16:34:35 ggiunta Exp $
+
+
+/**
+ * Replace array_key_exists()
+ *
+ * @category    PHP
+ * @package     PHP_Compat
+ * @link        http://php.net/function.array_key_exists
+ * @author      Aidan Lister <aidan@php.net>
+ * @version     $Revision: 1.1 $
+ * @since       PHP 4.1.0
+ * @require     PHP 4.0.0 (user_error)
+ */
+if (!function_exists('array_key_exists')) {
+    function array_key_exists($key, $search)
+    {
+        if (!is_scalar($key)) {
+            user_error('array_key_exists() The first argument should be either a string or an integer',
+                E_USER_WARNING);
+            return false;
+        }
+
+        if (is_object($search)) {
+            $search = get_object_vars($search);
+        }
+
+        if (!is_array($search)) {
+            user_error('array_key_exists() The second argument should be either an array or an object',
+                E_USER_WARNING);
+            return false;
+        }
+
+        return in_array($key, array_keys($search));
+    }
+}
+
+?>
\ No newline at end of file