give / vendor / vendor-prefixed / stellarwp / validation / src / Rules / Nullable.php

Nullable.php in GiveWP – Donation Plugin and Fundraising Platform 4.18.0, at vendor/vendor-prefixed/stellarwp/validation/src/Rules/Nullable.php

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1	<?php
2
3	declare(strict_types=1);
4
5	namespace Give\Vendors\StellarWP\Validation\Rules;
6
7	use Closure;
8	use Give\Vendors\StellarWP\Validation\Commands\SkipValidationRules;
9	use Give\Vendors\StellarWP\Validation\Contracts\ValidatesOnFrontEnd;
10	use Give\Vendors\StellarWP\Validation\Contracts\ValidationRule;
11
12	/**
13	* This rule skips further validation if the field is null. It is similar to Optional, but the only allowed value is
14	* null.
15	*
16	* @since 1.1.0
17	*/
18	class Nullable implements ValidationRule, ValidatesOnFrontEnd
19	{
20	/**
21	* @since 1.1.0
22	*/
23	public static function id(): string
24	{
25	return 'nullable';
26	}
27
28	/**
29	* @since 1.1.0
30	*/
31	public static function fromString(?string $options = null): ValidationRule
32	{
33	return new self();
34	}
35
36	/**
37	* @since 1.1.0
38	*
39	* @return SkipValidationRules\|void
40	*/
41	public function __invoke($value, Closure $fail, string $key, array $values)
42	{
43	if ($value === null) {
44	return new SkipValidationRules();
45	}
46	}
47
48	/**
49	* @since 1.1.0
50	*/
51	public function serializeOption()
52	{
53	return null;
54	}
55	}
56