Backports unserialize options introduced in PHP 7.0 to older PHP versions. This was originally designed as a Proof of Concept for Symfony Issue [#21090]. You can use this package in projects that rely on PHP versions older than PHP 7.0. In case you are using PHP 7.0+ the original unserialize will be used instead. From the [documentation]: ...Warning: Do not pass untrusted user input to unserialize. Unserialization can result in code being loaded and executed due to object instantiation and autoloading, and a malicious user may be able to exploit this. This warning holds true even when `allowed_classes` is used. Autoloader: /usr/share/php/Brumann/Polyfill/autoload.php