test.php register extra field

test.php

<?php

add_action('nsl_before_register', function ($provider) {
    /** @var $provider NextendSocialProvider */

    /**
     * You must return true if you want to add custom fields
     */
    add_filter('nsl_registration_require_extra_input', function ($askExtraData) {
        return true;
    });

    add_filter('nsl_registration_validate_extra_input', function ($userData, $errors) {
        /** @var $errors WP_Error */


        $isPost = isset($_POST['submit']);

        if ($isPost) {
            /**
             * You must add an error if your fields are not filled or does not fulfill your validation.
             * If no errors added, that means that the register form is fine.
             */

            if (!empty($_POST['favorite_color']) && is_string($_POST['favorite_color'])) {
                $userData['favorite_color'] = $_POST['favorite_color'];
            } else {
                $userData['favorite_color'] = '';
                $errors->add('favorite_color_missing', '<strong>' . __('ERROR') . '</strong>: Favorite Color can not be empty.', array('form-field' => 'favorite_color'));
            }
        } else {
            /**
             * Fill up user data with default values to prevent the notice in the form
             */
            $userData['favorite_color'] = '';
        }

        return $userData;
    }, 10, 2);

    /** You can use nsl_registration_form_start and nsl_registration_form_end action.  */
    add_action('nsl_registration_form_start', function ($userData) {
        ?>
        <p>
            <label for="favorite_color">Favorite Color<br/>
                <input type="text" name="favorite_color" id="favorite_color" class="input"
                       value="<?php echo esc_attr(wp_unslash($userData['favorite_color'])); ?>" size="20"/></label>
        </p>
        <?php
    });

    /**
     * $user_id contains the created user's id
     * $userData contains the previously validated input
     */
    add_action('nsl_registration_store_extra_input', function ($user_id, $userData) {
        add_user_meta($user_id, 'favorite_color', $userData['favorite_color']);
    }, 10, 2);
});