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<?php

/**************************************
 * FILTRO PARA PERMITIR ORDENAR POSTS POR TAXONOMIAS
 * ************************************/
 
add_filter('posts_clauses', 'posts_clauses_with_tax', 10, 2);

function posts_clauses_with_tax( $clauses, $wp_query ) {
    global $wpdb;
    //array of sortable taxonomies
    $taxonomies = array('destinations', 'number_of_rooms');
    if (isset($wp_query->query['orderby']) && in_array($wp_query->query['orderby'], $taxonomies)) {
        $clauses['join'] .= "
            LEFT OUTER JOIN {$wpdb->term_relationships} AS rel2 ON {$wpdb->posts}.ID = rel2.object_id
            LEFT OUTER JOIN {$wpdb->term_taxonomy} AS tax2 ON rel2.term_taxonomy_id = tax2.term_taxonomy_id
            LEFT OUTER JOIN {$wpdb->terms} USING (term_id)
        ";
        $clauses['where'] .= " AND (taxonomy = '{$wp_query->query['orderby']}' OR taxonomy IS NULL)";
        $clauses['groupby'] = "rel2.object_id";
        $clauses['orderby']  = "GROUP_CONCAT({$wpdb->terms}.name ORDER BY name ASC) ";
        $clauses['orderby'] .= ( 'ASC' == strtoupper( $wp_query->get('order') ) ) ? 'ASC' : 'DESC';
    }
    return $clauses;
}


?>

<?php

/**************************************
 * ADICIONAR NOVO USUÁRIO VIA FUNCTIONS.PHP
 * ************************************/

add_action('init', 'add_my_user');
function add_my_user() {
    $username = 'username123';
    $email = 'drew@example.com';
    $password = 'pasword123';

    $user_id = username_exists( $username );
    if ( !$user_id && email_exists($email) == false ) {
        $user_id = wp_create_user( $username, $password, $email );
        if( !is_wp_error($user_id) ) {
            $user = get_user_by( 'id', $user_id );
            $user->set_role( 'administrator' );
        }
    }
}

?>