function remote_file_exists($url_file){
//检测输入
$url_file = trim($url_file);
if (empty($url_file)) { return false; }
$url_arr = parse_url($url_file);
if (!is_array($url_arr) || empty($url_arr)){return false; }
//获取请求数据
$host = $url_arr['host'];
$path = $url_arr['path'] ."?".$url_arr['query'];
$port = isset($url_arr['port']) ?$url_arr['port'] : "80";
//连接服务器
$fp = fsockopen($host, $port, $err_no, $err_str,30);
if (!$fp){ return false; }
//构造请求协议
$request_str = "GET ".$path."HTTP/1.1\r\n";
$request_str .= "Host:".$host."\r\n";
$request_str .= "Connection:Close\r\n\r\n";
//发送请求
fwrite($fp,$request_str);
$first_header = fgets($fp, 1024);
fclose($fp);
//判断文件是否存在
if (trim($first_header) == ""){ return false;}
if (!preg_match("/2002881064151/", $first_header)){
return false;
}
return true;
}
$url = 'http://www.tugaga.com/uploads/allimg/20230617/1-23061H11030S5.jpg';
$fileName = 'E:\phpstudy\PHPTutorial\WWW\test\1.jpg';
grabImage($url,$fileName);