file upload - Keep getting Notice: Undefined index: file_name in D:\xampp\htdocs\andalusia\app\root\includes\file_uploader.php on line 10 {} -

i keep getting:

notice: undefined index: file_name in d:\xampp\htdocs\andalusia\app\root\includes\file_uploader.php on line 10 {}

the code supposed file name browser form input , extract it. working before, reason started getting above error.

file_uploader.php:

<?php  global $resp;     $fileuploader=new fileuploader($_get['file_name']);  class fileuploader{     public function __construct($file_name){     $url = "http://guessit.io/guess?filename=";      $theurl = $url . $file_name;      $encoded = urlencode($theurl);      $ch = curl_init();      curl_setopt($ch,curlopt_url,$theurl);     curl_setopt($ch,curlopt_returntransfer,true);     curl_setopt($ch,curlopt_header, false);         global $resp;      $resp = curl_exec($ch);      curl_close($ch);     return $resp; }      public function upload($current,$uploadfile){     if(move_uploaded_file($current->tmp_name,$uploadfile)){     return true;     } } }  function upfilestoobj($filearr){ foreach($filearr['name'] $keyee => $info) {     $uploads[$keyee] = new stdclass();     $uploads[$keyee]->name=$filearr['name'][$keyee];     $uploads[$keyee]->type=$filearr['type'][$keyee];     $uploads[$keyee]->tmp_name=$filearr['tmp_name'][$keyee];     $uploads[$keyee]->error=$filearr['error'][$keyee];     }     return $uploads; }   function get_file_extension($file_name) {   return substr(strrchr($file_name,'.'),1); }  echo $resp;  ?> 

form:

<div class="file_upload_form">    <h1>basic folder upload script!</h1>    <form enctype="multipart/form-data" id="upform" method="post">       <input type="file" name="file_input[]" id="file_input" multiple webkitdirectory="" directory="" mozdirectory>       <input id="click" type="submit" value="upload file" />    </form> </div>