php判断文件是否存在（状态码是否为404）

function http_status($url) {//判断播放器状态码
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_HEADER, 1);
    curl_setopt($ch, CURLOPT_NOBODY, 1);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_TIMEOUT, 5);
    curl_exec($ch);
    $status = (int)curl_getinfo($ch, CURLINFO_HTTP_CODE);
    curl_close($ch);
    /*return ($status == 404) ? 1 : 0;*/
    return $status;
}