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thinkphp中判断远路及非远程文件是否存在

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2016-06-13 10:54:18697browse

thinkphp中判断远程及非远程文件是否存在

  //判断远程文件是否存在 /*   函数:remote_file_exists   功能:判断远程文件是否存在   参数: $url_file - 远程文件URL     $flag  - true为判断远程文件,false为判断非远程文件   返回:存在返回true,不存在或者其他原因返回false */  static function remote_file_exists($url_file,$flag = true){  if($flag == true){ //默认是判断远程文件   //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("/200/", $first_header)){     return false;   }   return true;  }else if($flag == false){  //非远程文件   return file_exists($url_file);  } } 

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