php实现文件的自动ftp更新

完整代码。

Mirror update
';
 exit;
}
echo "Connected to $host.
";
@ $result=ftp_login($conn,$user,$password);
  if(!$result)
  {
   echo "Error: 用户 $user 登录失败。
";
   ftp_quit($conn);
   exit;
  }
  echo "login as $user
";
  //check file times to see if an update is required
  echo 'Checking file time....';
  if(file_exists($localfile))
  {
   $localtime=filetime($localfile);
   echo 'Local file last updated';
   echo date('G:i j-M-Y',$localtime);
   echo '
';
  }
  else
     $localtime=0;
    
  $remotetime=ftp_mdtm($conn,$remotefile);// 获取远程文件的修改时间函数
     if (!($remotetime>=0))
     {
      echo 'Can/'t access remote file time.
';
      $remotetime=$localtime+1; //make sure of an update
      
     }
     else
     {
      echo 'Remote file last updated';
      echo date('G:i j-M-Y',$remotetime);
      echo '
';
     }
     if(!($remotetime>$localtime))
     {
      echo 'Local copy is up to date.
';
        exit;
     }
     //download file
     echo 'Getting file from server....
';
     $fp=fopen($localfile,'w');
     if(!$success=ftp_fget($conn,$fp,$remotefile));
     {
      echo 'Error:Could not download file';
      ftp_quit($conn);
      exit;
     }
     fclose($fp);
     echo "File download successfully";
     //close connection to host
     ftp_quit($conn);

//fget()函数的用法：    
//ftp_get($conn,$localfile,$remotefile);
?>