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vendor/workerman/validation/library/Rules/Instance.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 if the input is an instance of the given class or interface.
+ *
+ * @author Alexandre Gomes Gaigalas <alganet@gmail.com>
+ * @author Danilo Benevides <danilobenevides01@gmail.com>
+ * @author Henrique Moody <henriquemoody@gmail.com>
+ */
+final class Instance extends AbstractRule
+{
+    /**
+     * @var string
+     */
+    private $instanceName;
+
+    /**
+     * Initializes the rule with the expected instance name.
+     */
+    public function __construct(string $instanceName)
+    {
+        $this->instanceName = $instanceName;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function validate($input): bool
+    {
+        return $input instanceof $this->instanceName;
+    }
+}