menu-image-devdmbootstrap3-fix.php

<?php
/**
 * Plugin Name: Menu Image + DevDMBootstrap3 Fix
 * Plugin URI: https://gist.github.com/macbookandrew/d40a416c65c615e0e15e1b6fd0645a67
 * Description: Fixes Menu Image PLugin used with DevDMBootstrap3 themes
 * Author: Andrew Minion/Pressed Solutions
 * Author URI: https://pressedsolutions.com/
 * Requires WP: 4.4.0
 * Requires PHP: 7.0
 * Version: 1.0.0
 *
 * @package Menu_Image_Fix
 */

add_action(
    'after_setup_theme', function () {
        if ( class_exists( 'Menu_Image_Plugin' ) && class_exists( 'wp_bootstrap_navwalker' ) ) {

            /**
             * Fix Menu Image when used with DevDMBootstrap3.
             *
             * @package Menu_Image_Fix
             */
            class Menu_Image_Plugin_DevDmBootstrap extends Menu_Image_Plugin {

                /**
                 * Kick things off.
                 */
                public function __construct() {
                    add_filter( 'walker_nav_menu_start_el', array( $this, 'fix_bootstrap_menu' ), 10, 4 );
                }

                /**
                 * Fix for wp_bootstrap_navwalker.
                 *
                 * The `wp_bootstrap_navwalker` class doesn’t apply the `nav_menu_item_title` filter.
                 *
                 * @param string   $item_output The menu item’s starting HTML output.
                 * @param WP_Post  $item        Menu item data object.
                 * @param int      $depth       Depth of menu item; useful for padding.
                 * @param stdClass $args        An object of wp_nav_menu() arguments.
                 *
                 * @return string                The menu item’s starting HTML.
                 */
                public function fix_bootstrap_menu( string $item_output, WP_Post $item, int $depth, stdClass $args ) {
                    $title_with_image = $this->menu_image_nav_menu_item_title_filter( $item->title, $item, $depth, $args );

                    return str_replace( '>' . $item->title . '<', '>' . $title_with_image . '<', $item_output );
                }

            }

            new Menu_Image_Plugin_DevDmBootstrap();
        }
    }
);