Addition to Jay Hoffmann's 'add_bootstrap_container_class' filter for Gravity Forms, replacing size classes with columns

add_bootstrap_container_class

<?php

/**
 * @description Gravity Forms size overides using Bootstrap Columns
 *
 * @author Jay Hoffmann (modified by Ryan Edwards)
 * 
 * @source https://jayhoffmann.com/using-gravity-forms-bootstrap-styles/
 */

add_filter( 'gform_field_container', 'add_bootstrap_container_class', 10, 6 );

function add_bootstrap_container_class( $field_container, $field, $form, $css_class, $style, $field_content ) {

  $id = $field->id;
  $field_id = is_admin() || empty( $form ) ? "field_{$id}" : 'field_' . $form['id'] . "_$id";
  switch ( $field->size ) {
    case 'medium':
      $col = 'col-8';
      break;
    case 'small':
      $col = 'col-4';
      break;
    default:
      $col = 'col';
      break;
  }
  if ( is_admin() ) {
    return $field_container;
  } else {
    return '<li id="' . $field_id . '" class="' . $col . '">{FIELD_CONTENT}</li>';
  }
}
?>