Run a Wordpress site via PHP's built-in web server

router.php

<?php
$root = $_SERVER['DOCUMENT_ROOT'];
chdir( $root );

$path = '/'.ltrim( parse_url( $_SERVER['REQUEST_URI'] )['path'],'/' );

if ( file_exists( $root.$path ) )
{
	if ( is_dir( $root.$path ) && substr( $path,strlen( $path ) - 1, 1 ) !== '/' )
	{
		header( 'Location: '.rtrim( $path,'/' ).'/' );
		exit;
	}

	if ( strpos( $path,'.php' ) === false )
	{
		return false;
	} else {
		chdir( dirname( $root.$path ) );
		require_once $root.$path;
	}
} else {
	include_once 'index.php';
}