如何在PHP中获取最终的重定向url

Question

我有这种网址

http://www.shareasale.com/r.cfm?u=552661&b=558522&m=51248&afftrack=&urllink=www%2Eericdress%2Ecom

但是当我使用curl时，它会将原始网址作为最终的重定向网址。

目前我正在使用以下代码

$options = array(
        CURLOPT_RETURNTRANSFER => true, // return web page
        CURLOPT_HEADER => true, // return headers
        CURLOPT_FOLLOWLOCATION => true, // follow redirects
        CURLOPT_ENCODING => "", // handle all encodings
        CURLOPT_USERAGENT => "spider", // who am i
        CURLOPT_AUTOREFERER => true, // set referer on redirect
        CURLOPT_CONNECTTIMEOUT => 120, // timeout on connect
        CURLOPT_TIMEOUT => 120, // timeout on response
        CURLOPT_MAXREDIRS => 10, // stop after 10 redirects
    );
    $ch = curl_init($url);
    curl_setopt_array($ch, $options);
    $content = curl_exec($ch);
    $err = curl_errno($ch);
    $errmsg = curl_error($ch);
    $header = curl_getinfo($ch);
    curl_close($ch);
    return $header['url'];