CodeSniffer is a great thing to implement, but you have to know how to use it. Unless you have to comply with a given coding standard because you are submitting your work to some external project, you are free to completely define your own coding standards.
PHP CodeSniffer should make this very easy for you, because there are already many single code sniffs that you can include in your own coding standard definition and need not write them from scratch. While exploring the possibilities of the existing Codesniffers, you might end up writing an extension to an existing sniff or one sniff on your own, if you feel the need.
If you want to start with CodeSniffer, first step would be to grab a set of sniffs that completely resemble your current coding standards, and check the resulting errors and warnings. Don't apply one of the predefined standards, as this will most likely result in too many errors with too few benefit if fixed. For example, if you do not use PHPDoc to generate a documentation, it would be no use to fulfill all the codesniffer errors about missing PHPDoc tags and comments.
