Requirements
Requirements – A list of software requirements
PHP_CodeSniffer
PHP_CodeSniffer requires PHP version 5.1.2 or greater.
Individual sniffs may have additional requirements, such as external applications and scripts. See the Configuration Options page for a list of these requirements.
SVN pre-commit hook
The pre-commit hook requires PHP version 5.2.4 or greater due to its use of the vertical whitespace character.