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