Sort posts in WordPress by 2 custom fields

So WordPress doesn’t have a way to sort posts by 2 custom fields. I tried different solutions for this option on the internet but never found anything that was working. So i made a custom hack based on a solution i found on internet.

This solution workes for WordPress 5.X at least.

function orderbyreplace($orderby) {
    global $table_prefix;
    return str_replace($table_prefix.'posts.menu_order', $table_prefix.'postmeta.meta_value, mt1.meta_value', $orderby); // Here you can add also after the meta_value DESC or ASC depending on how you wish the sort
$args = array(
  'orderby' => 'menu_order',
  'order' => 'ASC',
  'meta_query' => array(
            'key' => 'lastname',
            'value' => '',
            'compare' => 'LIKE'
            'key' => 'firstname',
            'value' => '',
            'compare' => 'LIKE'

$loop = new WP_Query( $args );

This solution will sort posts by lastname and firstname custom name.

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