PHP迅雷/快车/QQ旋风下载地址与普通URL链接互转

<?php
/*
* 将普通URL链接转换为迅雷、快车（FlashGet）、QQ旋风下载地址函数
* 爱E族：aiezu.com
*/
function download_url_encode( $url, $type = 'thunder' ) {
    switch( strtolower($type) ) {
        case "thunder":
            $url = sprintf("thunder://%s", base64_encode(sprintf("AA%sZZ", $url)));
            break;
        case "flashget":
            $url = sprintf("Flashget://%s", base64_encode(sprintf("[FLASHGET]%s[FLASHGET]", $url)));
            break;
        case "qqdl":
            $url = sprintf("qqdl://%s", base64_encode($url));
            break;
    }
        echo $url . "\n";
    return $url;
}

/*
* 将迅雷、快车（FlashGet）、QQ旋风下载地址，转换为普通URL链接函数
* 爱E族：aiezu.com
*/
function download_url_decode( $url ) {
    $match = parse_url( $url );
    switch( strtolower($match['scheme']) ) {
        case "thunder":
            $url = substr(base64_decode($match['host']), 2, -2);
            break;
        case "flashget":
            $url = substr(base64_decode($match['host']), 10, -10);
            break;
        case "qqdl":
            $url = base64_decode($match['host']);
            break;
    }
    return $url;
}

//普通链接转迅雷、快车、旋风下载链接（爱E族：aiezu.com）
$url = 'http://aiezu.com/download.zip'; //虚构的链接
echo sprintf("普通链接: %s\n", $url);
echo sprintf("迅雷链接: %s\n", download_url_encode($url, 'thunder'));
echo sprintf("快车链接: %s\n", download_url_encode($url, 'flashget'));
echo sprintf("旋风链接: %s\n", download_url_encode($url, 'qqdl'));

//迅雷、快车、旋风下载链接，转回普通链接（爱E族：aiezu.com）
echo sprintf("迅雷：%s\n", download_url_decode('thunder://QUFodHRwOi8vYWllenUuY29tL2Rvd25sb2FkLnppcFpa'));
echo sprintf("快车：%s\n", download_url_decode('Flashget://W0ZMQVNIR0VUXWh0dHA6Ly9haWV6dS5jb20vZG93bmxvYWQuemlwW0ZMQVNIR0VUXQ=='));
echo sprintf("旋风：%s\n", download_url_decode('qqdl://aHR0cDovL2FpZXp1LmNvbS9kb3dubG9hZC56aXA='));

普通链接: http://aiezu.com/download.zip
迅雷链接: thunder://QUFodHRwOi8vYWllenUuY29tL2Rvd25sb2FkLnppcFpa
快车链接: Flashget://W0ZMQVNIR0VUXWh0dHA6Ly9haWV6dS5jb20vZG93bmxvYWQuemlwW0ZMQVNIR0VUXQ==
旋风链接: qqdl://aHR0cDovL2FpZXp1LmNvbS9kb3dubG9hZC56aXA=

迅雷：http://aiezu.com/download.zip
快车：http://aiezu.com/download.zip
旋风：http://aiezu.com/download.zip