fatal Error on php 5.3.3 Centos

[Kwaadpepper]

PHP Fatal error: Can't inherit abstract function Sabberworm\CSS\Renderable::__toString() (previously declared abstract in Sabberworm\CSS\Value\Value) in /www/vendor/sabberworm/php-css-parser/lib/Sabberworm/CSS/Value/Value.php on line 7

my code used:
$oParser = new Sabberworm\CSS\Parser($css.$template['Template']['style']);
$oCss = $oParser->parse();
foreach($oCss->getAllDeclarationBlocks() as $oBlock) {
foreach($oBlock->getSelectors() as $oSelector) {
//Loop over all selector parts (the comma-separated strings in a selector) and prepend the id
$oSelector->setSelector('form table '.$oSelector->getSelector());
}
}
$css = $oCss->render();

My code is exactly the same as the example in the wiki.

My php info
PHP 5.3.3 (cli) (built: Aug 6 2014 05:54:27)
Copyright (c) 1997-2010 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies
with Suhosin v0.9.29, Copyright (c) 2007, by SektionEins GmbH

[Kwaadpepper]

According this thread http://stackoverflow.com/questions/17525620/php-fatal-error-cant-inherit-abstract-function
It is fixed from php 5.3.9 (php bug).

Anyway it would be awesome to fix the bug and keep compatibility with php 5.3.3.

[Kwaadpepper]

So obviously by removing abstract methods in sabberworm/php-css-parser/lib/Sabberworm/CSS/Value/Value.php, i got rid of the fatal error.
It's not really ennoying i think to comment abastract methods to prevent Fatal errors.

[sabberworm]

Thanks for the bug report and your research.