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

GiveWP – Donation Plugin and Fundraising Platform, version 4.16.9. 42 lines.

- Page: https://pluginprobe.com/plugins/give/4.16.9/code/src/DonationForms/Rules/SubscriptionFrequencyRule.php
- Raw: https://pluginprobe.com/plugins/give/4.16.9/raw/src/DonationForms/Rules/SubscriptionFrequencyRule.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
page URL, for example `https://pluginprobe.com/plugins/give/4.16.9/code/src/DonationForms/Rules/SubscriptionFrequencyRule.php#L10-L20`.

```php
<?php
namespace Give\DonationForms\Rules;

use Closure;
use Give\Donations\ValueObjects\DonationType;
use Give\Vendors\StellarWP\Validation\Contracts\ValidatesOnFrontEnd;
use Give\Vendors\StellarWP\Validation\Contracts\ValidationRule;

class SubscriptionFrequencyRule implements ValidationRule, ValidatesOnFrontEnd
{

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

    /**
     * @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): bool
    {
        $donationType = new DonationType($values['donationType']);

        return $donationType->isSubscription() && is_numeric($value);
    }

    public function serializeOption()
    {
        return null;
    }
}
```