PHP_CodeSniffer
Tokenize PHP files and detects violations of coding standards
...If you're using PHP_CodeSniffer as part of a team, or you're running it on a CI server, you may want to configure your project's settings using a configuration file. If you use PEAR, you can install PHP_CodeSniffer using the PEAR installer. This will make the phpcs and phpcbf commands immediately available for use.