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vendor/workerman/validation/library/Rules/Nullable.php

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+<?php
+
+/*
+ * Copyright (c) Alexandre Gomes Gaigalas <alganet@gmail.com>
+ * SPDX-License-Identifier: MIT
+ */
+
+declare(strict_types=1);
+
+namespace Respect\Validation\Rules;
+
+/**
+ * Validates the given input with a defined rule when input is not NULL.
+ *
+ * @author Jens Segers <segers.jens@gmail.com>
+ */
+final class Nullable extends AbstractWrapper
+{
+    /**
+     * {@inheritDoc}
+     */
+    public function assert($input): void
+    {
+        if ($input === null) {
+            return;
+        }
+
+        parent::assert($input);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function check($input): void
+    {
+        if ($input === null) {
+            return;
+        }
+
+        parent::check($input);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function validate($input): bool
+    {
+        if ($input === null) {
+            return true;
+        }
+
+        return parent::validate($input);
+    }
+}