Extended Coding Style Guide The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119. Overview This specification extends, expands and replaces PSR-2, the coding style guide and requires adherence to PSR-1, the basic coding standard. Like PSR-2, the intent of this