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vendor/workerman/validation/library/Rules/Slug.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 mb_strstr;
+use function preg_match;
+
+/**
+ * Validates whether the input is a valid slug.
+ *
+ * @author Carlos André Ferrari <caferrari@gmail.com>
+ * @author Danilo Correa <danilosilva87@gmail.com>
+ * @author Henrique Moody <henriquemoody@gmail.com>
+ * @author Nick Lombard <github@jigsoft.co.za>
+ */
+final class Slug extends AbstractRule
+{
+    /**
+     * {@inheritDoc}
+     */
+    public function validate($input): bool
+    {
+        if (!is_string($input) || mb_strstr($input, '--')) {
+            return false;
+        }
+
+        if (!preg_match('@^[0-9a-z\-]+$@', $input)) {
+            return false;
+        }
+
+        return preg_match('@^-|-$@', $input) === 0;
+    }
+}