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', esc_html( primer_get_wp_upgrade_message() ) ); } /** * Prevents the Customizer from being loaded on older WordPress versions. * * @action load-customize.php * @since 1.0.0 */ function primer_customize() { wp_die( esc_html( primer_get_wp_upgrade_message() ), '', array( 'back_link' => true ) ); } add_action( 'load-customize.php', 'primer_customize' ); /** * Prevents the Theme Preview from being loaded on older WordPress versions. * * @action template_redirect * @since 1.0.0 */ function primer_preview() { if ( isset( $_GET['preview'] ) ) { // input var ok. wp_die( esc_html( primer_get_wp_upgrade_message() ) ); } } add_action( 'template_redirect', 'primer_preview' );