<?php class MC4WP_Form_Previewer { public function add_hooks() { add_action( 'parse_request', array( $this, 'listen' ) ); } public function listen() { if ( empty( $_GET['mc4wp_preview_form'] ) ) { return; } try { $form = mc4wp_get_form( $_GET['mc4wp_preview_form'] ); } catch ( Exception $e ) { return; } show_admin_bar( false ); add_filter( 'pre_handle_404', '__return_true' ); remove_all_actions( 'template_redirect' ); add_action( 'template_redirect', array( $this, 'load_preview' ) ); } public function load_preview() { // clear output, some plugin or hooked code might have thrown errors by now. if ( ob_get_level() > 0 ) { ob_end_clean(); } $form_id = (int) $_GET['mc4wp_preview_form']; status_header( 200 ); require __DIR__ . '/views/preview.php'; exit; } }