errors.php

<?php
$status = $_SERVER['REDIRECT_STATUS'];
$codes = array(
       400 => array('400 Bad Request', 'The request cannot be fulfilled due to bad syntax.'),
       403 => array('403 Forbidden', 'The server has refused to fulfil your request.'),
       404 => array('404 Not Found', 'The page you requested was not found on this server.'),
       405 => array('405 Method Not Allowed', 'The method specified in the request is not allowed for the specified resource.'),
       408 => array('408 Request Timeout', 'Your browser failed to send a request in the time allowed by the server.'),
       500 => array('500 Internal Server Error', 'The request was unsuccessful due to an unexpected condition encountered by the server.'),
       502 => array('502 Bad Gateway', 'The server received an invalid response while trying to carry out the request.'),
       504 => array('504 Gateway Timeout', 'The upstream server failed to send a request in the time allowed by the server.'),
);
 
$title = $codes[$status][0];
$message = $codes[$status][1];
if ($title == false || strlen($status) != 3) {
       $message = 'Please supply a valid HTTP status code.';
}
 
echo '<h1>Hold up! '.$title.' detected</h1>
<p>'.$message.'</p>';
?>