input( 'id', 'post', 0 ); if ( ! $id ) { wp_send_json_error( array( 'message' => __( 'Invalid ID.', 'ad-fuz' ) ) ); } $count = CampaignAd::countByAd( $id ); wp_send_json_success( array( 'ad_id' => $id, 'campaign_count' => $count, 'has_campaigns' => $count > 0, ) ); } }