php/php-langspec — pull request #64 by eddiejaoude (2014-08-07 06:27:18+00:00)
Title: Bool & Null to lowercase from PSR

> 2.5. Keywords and True/False/Null
> PHP keywords MUST be in lower case.

> The PHP constants true, false, and null MUST be in lower case.

Reference: (section 2.5) http://www.php-fig.org/psr/psr-2/