PHP - ตรวจสอบให้หน่อยดิครับแก้ไขยังไง ผมยังไม่เก่งเรื่องนี้พอดีเป็นมือใหม่

<?php
if($_POST['submit'])
{
    $ftp_server = '';        
    $ftp_user_name = '';    
    $ftp_user_pass = '';       
      

    $local_file = $_FILES["filUpload"]["tmp_name"];
      
 
    $conn_id = ftp_connect($ftp_server, 21) or die ("Cannot connect to host");
      
  
    ftp_login($conn_id, $ftp_user_name, $ftp_user_pass) or die("Cannot login");
      

     if ($ftp_path = ftp_chdir($conn_id, "data")) {
            echo "Current directory is now: " . ftp_pwd($conn_id) . "\n";
    }
     
    $ftp_path = $_FILES["filUpload"]["name"];
    $upload = ftp_put($conn_id, $ftp_path, $local_file, FTP_BINARY);
    // check upload status:
    print (!$upload) ? 'Cannot upload' : '<br />Upload complete';
    print "\n";
      
    // close the FTP stream
    ftp_close($conn_id);
}
?>

    
    <form name="form1" method="post" action="upload2.php" enctype="multipart/form-data">
    

                  <input type="file" name="filUpload"><br>
		  <input name="submit" type="submit" value="Submit">
    
	</form>