filter by custom taxonomy and/or custom post type in the wordpress backend

admin_filters.php

<?php
    add_action('restrict_manage_posts','create_lists');
    function create_lists() {

        global $typenow;
        $filters_arr = array();
        // In which page do you want the filters to display, 
        // $filters_arr = array("emploi");
         
        if(in_array($typenow, $filters_arr)){
            $filters = array();
            //Custom Taxonomy sort , put each taxonomy that you want listed separated by a comma 
            //$filters = array("Custom taxonomy 1", "Custom taxonomy 2", "etc");

            foreach($filters as $tax_slug){
                $tax_obj = get_taxonomy($tax_slug);
                $tax_name = $tax_obj->labels->name;

                $terms = get_terms($tax_slug);

                echo "<select name='$tax_slug' id='$tax_slug' class='postform'>";
                echo "<option value=''>View all $tax_name</option>";

                foreach($terms as $term){
                    echo '<option value='. $term->slug, $_GET[$tax_slug] == $term->slug ? ' selected="selected"' : '','>' . $term->name .'</option>';
                }

                echo "</select>";
            }

            list_cpt("recruteurs");

        }

    }
    function list_cpt($pt){

        $get = new WP_Query(  array(
            'posts_per_page'        =>  -1,
            'post_type'         =>  $pt,

            'post_status'       =>  'publish',
            'orderby'           => 'menu_order',
            'order'             => "ASC",
            'supress_filters'   =>  0 )
        );

        //get cpt info
        $info = get_post_type_object( $pt );
        $cpt_name = $info->labels->name;

        echo "<select name='cpt' id='".$pt."' class='postform'>";
        echo "<option value=''>View all ".$cpt_name."</option>";
        //print_r($get);
        foreach($get->posts as $option){
            //echo "<option value='".$option->ID, $_GET[$tax_slug] == $term->slug ? ' selected="selected"' : '','>'.$option->post_title."</option>";
            echo '<option value='. $option->ID, $_GET['cpt'] == $option->ID ? ' selected="selected"' : '','>' . $option->post_title .'</option>';
        }

        echo "</select>";
    }

?>