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cacme/vendor/workerman/validation/library/Rules/PhpLabel.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;
+
+use function is_string;
+use function preg_match;
+
+/**
+ * Validates if a value is considered a valid PHP Label, so that it can be used as a variable, function or class name.
+ *
+ * @author Danilo Correa <danilosilva87@gmail.com>
+ * @author Emmerson Siqueira <emmersonsiqueira@gmail.com>
+ * @author Henrique Moody <henriquemoody@gmail.com>
+ */
+final class PhpLabel extends AbstractRule
+{
+    /**
+     * {@inheritDoc}
+     */
+    public function validate($input): bool
+    {
+        return is_string($input) && preg_match('/^[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*$/', $input);
+    }
+}