urldecode
Decodes any encoded sequences %##. The "plus" symbol ('+') is decoded into a space character.Example: "%D1%81%D1%82%D1%80%D0%BE%D0%BA%D0%B0" → "строка".
It yields a result similar to the PHP function urldecode().
Example: "%D1%81%D1%82%D1%80%D0%BE%D0%BA%D0%B0" → "строка".