How do I add multiple product gallery images from front-end woocommerce??

Watson

my code

function.php

function my_handle_attachment($file_handler,$post_id,$set_thu=false) {
  if ($_FILES[$file_handler]['error'] !== UPLOAD_ERR_OK) __return_false();

  require_once(ABSPATH . "wp-admin" . '/includes/image.php');
  require_once(ABSPATH . "wp-admin" . '/includes/file.php');
  require_once(ABSPATH . "wp-admin" . '/includes/media.php');

  $attach_id = media_handle_upload( $file_handler, $post_id );

  if ( is_numeric( $attach_id ) ) {

    update_post_meta( $post_id, '_product_image_gallery', $attach_id );

  }
  return $attach_id;  
}

Front-end

if ( $_FILES ) { 
        $files = $_FILES["my_file_upload"];  

        foreach ($files['name'] as $key => $value) {      

                if ($files['name'][$key]) { 

                    $file = array( 
                        'name' => $files['name'][$key],
                        'type' => $files['type'][$key], 
                        'tmp_name' => $files['tmp_name'][$key], 
                        'error' => $files['error'][$key],
                        'size' => $files['size'][$key]
                    ); 
                    $_FILES = array ("my_file_upload" => $file); 

                    $newupload = my_handle_attachment( "my_file_upload", $post_id);


                } 

            } 

    }

input
<input type="file" name="my_file_upload[]" multiple="multiple" >
I am using these codes so that it will upload all images and attach them to the correct post. It's not working only the last image will show up in products gallery image section. What is the error which I am unware of?

anderson

Here is the correct code

if ( ! empty( $_FILES['muti_files'] )  ) {
            $files = $_FILES['muti_files'];
            foreach ($files['name'] as $key => $value){
                if ($files['name'][$key]){
                    $file = array(
                    'name' => $files['name'][$key],
                    'type' => $files['type'][$key],
                    'tmp_name' => $files['tmp_name'][$key],
                    'error' => $files['error'][$key],
                    'size' => $files['size'][$key]
                    );
                }
                $_FILES = array("muti_files" => $file);
                $i=1;
                    foreach ($_FILES as $file => $array) {
                          if ($_FILES[$file]['error'] !== UPLOAD_ERR_OK) __return_false();
                            require_once(ABSPATH . "wp-admin" . '/includes/image.php');
                            require_once(ABSPATH . "wp-admin" . '/includes/file.php');
                            require_once(ABSPATH . "wp-admin" . '/includes/media.php');
                            $attachment_id = media_handle_upload($file, $post_id);
                            $vv .= $attachment_id . ",";
                            $i++;
                    }
                    update_post_meta($post_id, '_product_image_gallery',  $vv);
            }
        }