FacetWP little helper to find active facets from php

functions.php

<?php 

//helper in functions.php
function my_get_facet_vars(){
    $vars = [];
    foreach ($_GET as $key => $value) {
        $pos = strpos($key, 'fwp_');
        if ($pos == 0) {
            $key = str_replace("fwp_", "", $key);
            $vars[$key] = $value;
        }
    }
    return $vars;
}

// and use this to check for active filters
if( count($filters) == 0 ) //do stuff;