$idarray=array; $data = array post_type = qqproduct post_status = publish orderby = DATE order = DESC posts_per_page = $per_page paged = $paged ;$meta_query = array; Initialize the meta

Here is the revised else condition added to the code:

} else {
    if ($value) {
        $stros = explode(",", $value);
        $trainer_query = array('relation' => 'OR');

        foreach ($stros as $stro) {
            $trainer_query[] = [
                'key' => 'qq_att_' . $key,
                'value' => $stro,
                'compare' => 'LIKE',
            ];
            $keys[] = $stro;
        }

        $meta_query[] = $trainer_query;
    }
}

This else condition checks if the value is not empty and then creates a meta query for the given key and value. The meta query is then added to the existing meta query array