yii\base\Security::compareString PHP Méthode

    public function compareString($expected, $actual)
    {
        $expected .= "";
        $actual .= "";
        $expectedLength = StringHelper::byteLength($expected);
        $actualLength = StringHelper::byteLength($actual);
        $diff = $expectedLength - $actualLength;
        for ($i = 0; $i < $actualLength; $i++) {
            $diff |= ord($actual[$i]) ^ ord($expected[$i % $expectedLength]);
        }
        return $diff === 0;
    }