source: Dev/trunk/src/client/dojox/data/demos/openSearchProxy.php

<?php
// A simple proxy for testing the OpenSearchStore
// Note, this simple proxy requires a curl-enabled PHP install
if(!$_GET['url']){ return; }

$url = str_replace(array(';;;;', '%%%%'), array('?', '&'), $_GET['url']);
if(stripos($url, "http://intertwingly.net/") === 0 || 
        stripos($url, "http://www.intertwingly.net/") === 0 || 
        stripos($url, "http://www.shutterpoint.com/") === 0 || 
        stripos($url, "http://technorati.com/") === 0){
        $ch = curl_init($url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        $results = curl_exec($ch);
        header('HTTP/1.1 ' . curl_getinfo($ch, CURLINFO_HTTP_CODE) . ' OK');
        if($_GET['osd'] === 'true'){
                $xml = new SimpleXMLElement($results);
                if($xml->Url){
                        foreach($xml->Url as $url){
                                $url['template'] = $_SERVER['SCRIPT_NAME'].'?url='.str_replace(array('?', '&'), array(';;;;', '%%%%'), $url['template']);
                        }
                        header('Content-Type: text/xml');
                        print $xml->asXML();
                }
        }else{
                header('Content-Type: '.curl_getinfo($ch, CURLINFO_CONTENT_TYPE));
                print $results;
        }
}else{
        header("HTTP/1.0 403 Forbidden");
        header("Status: 403 Forbidden");
        print "Provided URL not allowed by this demo proxy.";
}