routing.php - rewrite urls using php built in web server

routing_gonzalo123.php

<?php
// www/routing.php
// http://gonzalo123.com/2012/10/15/how-to-rewrite-urls-with-php-5-4s-built-in-web-server/
if (preg_match('/\.(?:png|jpg|jpeg|gif)$/', $_SERVER["REQUEST_URI"])) {
    return false;
} else {
    include __DIR__ . '/index.php';
}

// cd ./
// php -S localhost:8888 www/routing.php

routing_lornajane.php

<?php
// http://www.lornajane.net/posts/2012/php-5-4-built-in-webserver
if (file_exists(__DIR__ . '/' . $_SERVER['REQUEST_URI'])) {
   return false; // serve the requested resource as-is.
}

if ($_SERVER['SCRIPT_NAME'] == '/dev.php' ) {
    include_once 'dev.php';
} else {
    include_once 'index.php';
}

// cd ./www
// php -S localhost:8888 routing.php

Provided code will not work when requesting files with query params (which is common for CSS and JS files).
Modifed version that strips the query string:

<?php

function _requestedFileExists ($requestUri) {
	$queryStart = strpos($requestUri, '?');
	if ($queryStart !== -1) {
		$requestUri = substr($requestUri, 0, $queryStart);
	}
	return file_exists(__DIR__ . DIRECTORY_SEPARATOR . $requestUri);
}


if (_requestedFileExists($_SERVER['REQUEST_URI'])) {
	return false;
}

require 'index.php';

I've just updated PHP-Built-in-web-server-Router with some fixes for wordpress mostly, you should give it a try if you're planning on using a framework.