WordPress Multi File Upload Helper Function

wordpress-multi-file-upload-snippet.php

/**
 * Takes in a PHP multi file form field (that uses the name="identifer[]" bracket notation), uploads each attachment, 
 * provides them with attachment ids, then cleans up after itself. 
 * Returns: array of attachment ids.
 * Example usage: $attachment_ids = multi_file_media_upload($_FILES['multi-upload-field']);
 * Example form input field: <input name="myfiles[]" type="file" multiple="true" />
 */
function multi_file_media_upload($multiFile) {
    // TODO: Test which of these can be removed for file upload functions used
    require_once(ABSPATH . 'wp-admin/includes/media.php');
    require_once(ABSPATH . 'wp-admin/includes/file.php');
    require_once(ABSPATH . 'wp-admin/includes/image.php');
    require_once(ABSPATH . 'wp-includes/pluggable.php'); 

    $attachment_ids = array();

    // for multiple file upload.
    $upload_overrides = array( 'test_form' => FALSE );
    $files = $multiFile;
    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 ]
        );

        // Temporary upload of the file
        $upload = wp_handle_upload( $file, $upload_overrides );
        // Properly give the file an attachment ID
        $file_array = array(
          'name' => $file['name'],
          'tmp_name' => $upload['file']
        );
        array_push( $attachment_ids, media_handle_sideload($file_array) );
        // Delete the temporary upload
        unlink( $upload['file'] );
      }
    }
    return $attachment_ids;
  }