Simple e-mail confirmation plugin for WordPress.

readme.md

Email Confirmation for WordPress

Send an email to the user with confirmation code and store form data in database until user confirms.

Requires: PHP 5.3+

Usage

Make sure to validate all your data before using Email Confirmation, then you can call the plugin anywhere in your templates:

<?php
$headers = 'From: admin <noreply@admin>';
$to = $_POST['email'];
$subject = 'Confirm';
// The unique token can be inserted in the message with %s
$message = 'Thank you. Please <a href="<?= home_url('confirm') ?>?token=%s">confirm</a> to continue';

if ($isAllValid) {
  EmailConfirmation::send($to, $subject, $message, $headers);
}

The above will send an email with a unique token for confirmation and store the $_POST array in the DB.

The confirmation link can be any page or template you want. For a minimal setup all you need is to pass the token in $_GET. The check method will retrieve the data for a specific token and return it, then remove it from the DB. If the token doesn't exist it will return null.

<?php
$data = EmailConfirmation::check($_GET['token')); // $_POST saved for this token

email-confirmation.php

<?php
class EmailConfirmation{

    // Create prefix
    const PREFIX = 'email-confirmation-';

    public static function send($to, $subject, $message, $headers){

        $token = sha1(uniqid());
        $oldData = get_option(self::PREFIX .'data') ?: array();
        $data = array();
        $data[$token] = $_POST;
        update_option(self::PREFIX .'data', array_merge($oldData, $data));
        wp_mail($to, $subject, sprintf($message, $token), $headers);
    }

    public static function check($token){

        $data = get_option(self::PREFIX .'data');

        if (isset($data[$token])) {

            $userData = $data[$token];
            unset($data[$token]);
            update_option(self::PREFIX .'data', $data);

        }else{

            $userData =  '';
        }

        return $userData;
    }
}