php 判断远程文件是否存在

php 判断远程文件是否存在

if (!function_exists('check_remote_file_exists')) {
    /**
     * 判断远程文件是否存在.
     * @param $url string http或https开头的绝对地址
     * @return string
     * @Date: 2020-07-31 16:47:06
     * @Author: centphp.com
     */
    function check_remote_file_exists($url)
    {
        $curl = curl_init($url);
        curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($curl, CURLOPT_NOBODY, true);
        //curl_setopt($curl, CURLOPT_CUSTOMREQUEST, 'GET');
        $result = curl_exec($curl);

        //print_r($result);
        $bool = false;
        if ($result !== false) {
            $statusCode = curl_getinfo($curl, CURLINFO_HTTP_CODE);
            if ($statusCode == 200) {
                $headInf = get_headers($url, 1);
                $time = strtotime($headInf['Last-Modified']);
                if ($time + 2 < time()) {
                    $bool = true;
                }
            }
        }
        curl_close($curl);

        return $bool;
    }
}