Convert StreamTheWorld.com callsign to actual stream URL

streamtheworld-parser.php

<?php
/*
 * Because the actual streaming URLs from StreamTheWorld.com stations change often, 
 * this script will dynamically redirect you to the stream URL.
 *
 * Do with it what you want :-)
 * Koen (koenvh.nl)
 *
 * Usage: Provide a "sign" argument in your get request. 
 * This is the station's sign, which is the part after the slash without the (AAC)_SC part.
 *
 */
if(isset($_GET["sign"])){
    $ini = parse_ini_string(file_get_contents("http://provisioning.streamtheworld.com/pls/" . $_GET["sign"] . ".pls"));
    //var_dump($ini);
    $url = $ini["File1"];
    if(filter_var($url, FILTER_VALIDATE_URL)){
        header("Location: " . $url);
        die();
    } else {
        echo "Invalid URL: " . $url;
    }
} else {
    echo "No sign";
}