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

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+<?php
+
+/*
+ * This file is part of Respect/Validation.
+ *
+ * (c) Alexandre Gomes Gaigalas <alexandre@gaigalas.net>
+ *
+ * For the full copyright and license information, please view the LICENSE file
+ * that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Respect\Validation\Rules;
+
+use Respect\Validation\Helpers\CanValidateUndefined;
+
+use function in_array;
+
+/**
+ * Abstract class for searches into arrays.
+ *
+ * @author Henrique Moody <henriquemoody@gmail.com>
+ */
+abstract class AbstractSearcher extends AbstractRule
+{
+    use CanValidateUndefined;
+
+    /**
+     * {@inheritDoc}
+     */
+    public function validate($input): bool
+    {
+        $dataSource = $this->getDataSource();
+        if ($this->isUndefined($input) && empty($dataSource)) {
+            return true;
+        }
+
+        return in_array($input, $dataSource, true);
+    }
+
+    /**
+     * @return mixed[]
+     */
+    abstract protected function getDataSource(): array;
+}