Upload file via ajax WORDPRESS

Upload files via ajax wordpress

///////////////////////////////////////////////
// PHP
///////////////////////////////////////////////
// Create a function to handle files sent through ajax

function image_wp_handle_upload($file_handler) {

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

  $upload = wp_handle_upload( $file_handler, array('test_form' => false ) );

  $attachment = array(
    'post_mime_type' => $upload['type'],
    'post_title' => sanitize_file_name(basename($upload['url'])),
    'post_content' => '',
    'post_status' => 'inherit'
  );

  $attach_id = wp_insert_attachment( $attachment, $upload['file'] );

  return $attach_id;
}


// ADD TO A REPEATER FIELD OR A WP AJAX FUNCTION

$uploadedfile = $_FILES;

foreach($uploadedfile as $galeria){
          $imageGallery = image_wp_handle_upload( $galeria );
          
          $row = array(
            'field_60011e134aa6a'   => $imageGallery           
          );
          
          add_row('field_60011dfa4aa69', $row, 'user_'. $user_id);

}


///////////////////////////////////////////////
// JAVASCRIPT
///////////////////////////////////////////////
    
$('#user_register').on('submit', function(e){

        var fd = new FormData(document.querySelector('#user_register')); // Select form DOM element
        var names = [];

        var file_data = $('#files')[0].files; // FILES is ID from input file
            for(var i = 0;i<file_data.length;i++){
            fd.append("file_"+i, file_data[i]);
        }
        fd.append('file[]',names);
        fd.append('action','register');  // Name of AJAX function

        var serializeDados = $(this).serialize();
        $.ajax({
            url: ajaxUrl,
            data:fd,
            contentType: false,
            processData: false,
            type:'POST',
            success:function(data){
                console.log(data);
            },
            beforeSend : function(d){
             
            }
        });
        return false;
    });