# give/4.16.9/src/DonationForms/Rules/AuthenticationRule.php

GiveWP – Donation Plugin and Fundraising Platform, version 4.16.9. 36 lines.

- Page: https://pluginprobe.com/plugins/give/4.16.9/code/src/DonationForms/Rules/AuthenticationRule.php
- Raw: https://pluginprobe.com/plugins/give/4.16.9/raw/src/DonationForms/Rules/AuthenticationRule.php
- Modified: 2023-10-16T17:55:46+00:00

Line numbers below start at 1. Link to a line or a range by appending a fragment to the
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```php
<?php
namespace Give\DonationForms\Rules;

use Closure;
use Give\Vendors\StellarWP\Validation\Contracts\ValidationRule;

class AuthenticationRule implements ValidationRule
{

    /**
     * @since 3.0.0
     */
    public static function id(): string
    {
        return 'authentication';
    }

    /**
     * @since 3.0.0
     */
    public static function fromString(string $options = null): ValidationRule
    {
        return new self();
    }

    /**
     * @since 3.0.0
     */
    public function __invoke($value, Closure $fail, string $key, array $values)
    {
        if (!is_user_logged_in()) {
            $fail(__('Login required.', 'give'));
        }
    }
}

```