[Forminator] Limit Submissions by Birthdate

wpmudev-forminator-limit-submissions-by-birthdate.php

<?php
/**
 * Plugin Name: [Forminator] Limit Submissions by Birthdate
 * Plugin URI: https://premium.wpmudev.org/
 * Description: If the user does not have the minimum age necessary, the submission is not finished
 * Author: Glauber Silva @ WPMUDEV
 * Author URI: https://premium.wpmudev.org/
 * Task: SLS-1644
 * License: GPLv2 or later
 *
 * @package WPMUDEV_Forminator_Limit_Submissions_by_Birthdate
 */

defined( 'ABSPATH' ) || exit;

if ( ! class_exists( 'WPMUDEV_Forminator_Limit_Submissions_by_Birthdate' ) ) {
    
    class WPMUDEV_Forminator_Limit_Submissions_by_Birthdate {

        // Form field to validate
        private $field = 'date-1';
        // Form ID to validate
        private $form_id = 607;
        // Is necessary to have this minimum age or more to be able to do the submission
        private $minimum_age = 55;
        // Default message for the users with less than minimum age necessary
        private $message = 'You must be 55 or older to join the club!';

        private static $instance = null;        

        public static function get_instance() {

			if ( is_null( self::$instance ) ) {
				self::$instance = new WPMUDEV_Forminator_Limit_Submissions_by_Birthdate();
			}

			return self::$instance;
		}

        private function __construct() {
            $this->init();
        }

        private function init(){            
            // Show custom notifications
            add_action( 'forminator_custom_form_submit_errors', array( $this, 'wpmudev_forminator_limit_form_submissions' ), 10, 3 );
        }

        private function wpmudev_get_days_interval_between_two_dates( $date1, $date2 ) {

            $date1 = (int) $date1;
            $date2 = (int) $date2;
    
            if ($date1 > $date2) {
                $date_diff = $date1 - $date2;
            } else {
                $date_diff = $date2 - $date1;
            }
    
            $days_diff = floor( $date_diff / ( 60 * 60 * 24 ) );
    
            return $days_diff;
        }


        public function wpmudev_forminator_limit_form_submissions( $submit_errors, $form_id, $field_data_array ){
                        
            if ( absint( $form_id ) !== $this->form_id ){
                return $submit_errors;
            }

            $response = array(
                'success' => false,
                'errors'  => false,
            );            

            foreach( $field_data_array as $field ){

                if ( $field['name'] === $this->field ){
                    
                    $birthdate = strtotime( sanitize_text_field( $field['value'] ) );
                    $today = current_time( 'timestamp' );
                    
                    $days_diff  = $this->wpmudev_get_days_interval_between_two_dates( $birthdate, $today );

                    if ( $days_diff > 0 ) {
                        
                        $years_diff = $days_diff / 365;

                        if( $years_diff < $this->minimum_age ){
                            $response['message'] = __( $this->message, 'wpmudev' );
                            wp_send_json_error( $response );
                        }

                    }                    
                }
            }

            return $submit_errors;		
		}       
	}
	
    add_action(
		'plugins_loaded',
		function() {
			return WPMUDEV_Forminator_Limit_Submissions_by_Birthdate::get_instance();
		}
	);
}