Proxy script for rewritng purl redirected URIs to the correct URLs for OntoWiki

purlproxy.php

<?php

$request = str_replace($_SERVER['SCRIPT_NAME'], '', $_SERVER['REQUEST_URI']);

$purl = 'http://purl.org' . $request;

$proxyTarget = array(
    '/voc/ex/' => 'http://example.org/site/schema/?r=',
);

foreach ($proxyTarget as $path => $target) {
    if (strpos($request, $path) === 0) {
        $redirect = $target . urlencode($purl);
	echo 'redirect to ' . $redirect;
    	header('location: ' . $redirect);
        return;
    }
}