: str_replace(): Passing null to parameter #2 ($replace) of type array|string is deprecated in
namespace WPForms\Admin\Builder\Ajax;
* Form Builder Panel Loader AJAX actions.
* Determine if the class is allowed to load.
private function allow_load(): bool {
// phpcs:ignore WordPress.Security.NonceVerification.Recommended
$action = isset( $_REQUEST['action'] ) ? sanitize_text_field( wp_unslash( $_REQUEST['action'] ) ) : '';
// Load only in the case of AJAX calls form the Form Builder.
return wpforms_is_admin_ajax() && strpos( $action, 'wpforms_builder_' ) === 0;
if ( ! $this->allow_load() ) {
private function hooks() {
add_action( 'wp_ajax_wpforms_builder_load_panel', [ $this, 'load_panel_content' ] );
public function load_panel_content() {
$data = $this->get_prepared_data( 'load_panel' );
$panel_class = '\WPForms_Builder_Panel_' . ucfirst( $data['panel'] ?? '' );
if ( ! class_exists( $panel_class ) ) {
// Load panel base class.
require_once WPFORMS_PLUGIN_DIR . 'includes/admin/builder/panels/class-base.php';
$file = WPFORMS_PLUGIN_DIR . "includes/admin/builder/panels/class-{$data['panel']}.php";
$file_pro = WPFORMS_PLUGIN_DIR . "pro/includes/admin/builder/panels/class-{$data['panel']}.php";
if ( wpforms()->is_pro() && file_exists( $file_pro ) ) {
} elseif ( file_exists( $file ) ) {
$panel_obj = $panel_class::instance();
if ( ! method_exists( $panel_obj, 'panel_content' ) ) {
wp_send_json_error( esc_html__( 'Invalid panel.', 'wpforms-lite' ) );
$panel_obj->panel_output( [], $data['panel'] );
$panel_content = ob_get_clean();
wp_send_json_success( $panel_content );
* Get prepared data before perform ajax action.
* @param string $action Action: `save` OR `delete`.
* @noinspection PhpSameParameterValueInspection
private function get_prepared_data( string $action ): array {
if ( ! check_ajax_referer( 'wpforms-builder', 'nonce', false ) ) {
wp_send_json_error( esc_html__( 'Most likely, your session expired. Please reload the page.', 'wpforms-lite' ) );
// Check for permissions.
if ( ! wpforms_current_user_can( 'edit_forms' ) ) {
wp_send_json_error( esc_html__( 'You are not allowed to perform this action.', 'wpforms-lite' ) );
if ( $action === 'load_panel' ) {
// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
$data['panel'] = ! empty( $_POST['panel'] ) ? sanitize_key( $_POST['panel'] ) : '';