' . __( 'Free', 'airi' ) . ''; } add_filter( 'learn_press_course_price_html_free', 'airi_learnpress_free_course_label' ); /** * Wraps paid course label in span * */ function airi_learnpress_paid_course_label( $price ) { return '' . $price . ''; } add_filter( 'learn_press_course_price_html', 'airi_learnpress_paid_course_label' );