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vendor/workerman/validation/library/Rules/StartsWith.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_array;
+use function is_string;
+use function mb_stripos;
+use function mb_strpos;
+use function reset;
+
+/**
+ * Validates whether the input starts with a given value.
+ *
+ * @author Alexandre Gomes Gaigalas <alganet@gmail.com>
+ * @author Henrique Moody <henriquemoody@gmail.com>
+ * @author Marcelo Araujo <msaraujo@php.net>
+ */
+final class StartsWith extends AbstractRule
+{
+    /**
+     * @var mixed
+     */
+    private $startValue;
+
+    /**
+     * @var bool
+     */
+    private $identical;
+
+    /**
+     * @param mixed $startValue
+     */
+    public function __construct($startValue, bool $identical = false)
+    {
+        $this->startValue = $startValue;
+        $this->identical = $identical;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function validate($input): bool
+    {
+        if ($this->identical) {
+            return $this->validateIdentical($input);
+        }
+
+        return $this->validateEquals($input);
+    }
+
+    /**
+     * @param mixed $input
+     */
+    protected function validateEquals($input): bool
+    {
+        if (is_array($input)) {
+            return reset($input) == $this->startValue;
+        }
+
+        if (is_string($input) && is_string($this->startValue)) {
+            return mb_stripos($input, $this->startValue) === 0;
+        }
+
+        return false;
+    }
+
+    /**
+     * @param mixed $input
+     */
+    protected function validateIdentical($input): bool
+    {
+        if (is_array($input)) {
+            return reset($input) === $this->startValue;
+        }
+
+        if (is_string($input) && is_string($this->startValue)) {
+            return mb_strpos($input, $this->startValue) === 0;
+        }
+
+        return false;
+    }
+}