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<?php

/*

* This file is part of php-cache\cache-bundle package.

*

* (c) 2015 Aaron Scherer <aequasi@gmail.com>, Tobias Nyholm <tobias.nyholm@gmail.com>

*

* This source file is subject to the MIT license that is bundled

* with this source code in the file LICENSE.

*/

namespace Cache\CacheBundle;

/**

* A class to normalize cache keys.

*

* @author Tobias Nyholm <tobias.nyholm@gmail.com>

*/

class KeyNormalizer

{

/**

* Remove all characters that is not supported by PSR6.

*

* @param $key

*/

public static function onlyValid($key)

{

return preg_replace('|[^A-Za-z0-9_\.]|', '', $key);

}

/**

* Remove all characters that are marked as reserved in PSR6.

*

* @param string $key

*/

public static function noInvalid($key)

{

return preg_replace('|[\{\}\(\)/\\\@\:]|', '', $key);

}

}