类扩展自我

Question

I stumbled across this code today

class FILTER extends self
{
    protected static function sanitizeHtml($html)
    {
        static $parser;

        if (!isset($parser)) $parser = new HTMLPurifier;

        return $parser->purify($html);
    }
}

What does this class gain from extendingself? Im not quite sure if this ruby example is equivalent or even applicable to PHP.

Answer 1

That's not valid code, wherever you saw it. It throws up an error.

Fatal error: Cannot use 'self' as class name as it is reserved

You can see an example here: https://eval.in/775753