thinkphp中判断远路及非远程文件是否存在

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Release: 2016-06-13 13:05:35
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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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