ขอ code การใช้ 404 Page Not Found แทน Mod_Rewrite

<?php
$url = 'php/11111.html';

list($category, $id) = explode('/', $url);

switch $category:
{
	case 'php':
		require_once 'viewtopic.php?id=' . $id;
		exit;
		break;
	case 'asp':
		require_once 'viewtopic.php?id=' . $id;
		exit;
		break;
	case 'vb':
		require_once 'viewtopic.php?id=' . $id;
		exit;
		break;
}
?>

<?php

$url = 'php/11111.html';

list($category, $id) = split('[/.]', $url);

echo $category;

echo $id;

exit;

switch ( $category )
{
	case 'php':
		require_once 'viewtopic.php?id=' . $id;
		exit;
		break;
	case 'asp':
		require_once 'viewtopic.php?id=' . $id;
		exit;
		break;
	case 'vb':
		require_once 'viewtopic.php?id=' . $id;
		exit;
		break;
}
?>