Getting Term ID from Term Name for WordPress Query

Check for variables names:

  $excludes="";
        if($filtering_excludes) {

         $exclude_terms = explode(", ", $filtering_excludes);
            foreach ($exclude_terms as $exclude_term) {

                $term = get_term_by( 'name',  $exclude_term,  $filtering_tax  );
                 $exclude_term_array[] = $term->term_id;         

            }

            $excludes= implode(", ", $exclude_term_array);

        }