Flitch is a coding standard validator for PHP, meant as a replacement for PHPCS. It is partly based on PHPca https://github.com/spriebsch/phpca by Stefan Priebsch, but should not be confused with a fork of it.
Flitch will scan through your source files and detect coding standard violations. Currently it ships with PSR-1 and PSR-2 as core standards, but can be extended by custom standards.
Since this question came up a few times already, here is a list of reasons:
Custom standards should be located in the directory .flitch/standards in your home directory.
To install Flitch, simply clone it with git. Additionally you can symlink the "flitch" executable to a directory in your PATH.
For command line options, run flitch --help