PHP获得短域名的真实地址

function get_real_url($myurl){$ch = curl_init();curl_setopt($ch, CURLOPT_URL,            $myurl);curl_setopt($ch, CURLOPT_HEADER,         1);curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);curl_setopt($ch, CURLOPT_NOBODY,         1);curl_setopt($ch, CURLOPT_RETURNTRANSFER, 0);$ret = curl_exec($ch);if (empty($ret)) {die(curl_error($ch));curl_close($ch);return false;} else {$info = curl_getinfo($ch);curl_close($ch);if (empty($info['http_code'])) {return false;} else {return $info['url'];}}}