You may or may not know that the PHP channel has recently transitioned to Github for draft submissions. This experimental approach, aside from providing a unified approach to submitting new material and keeping it all versioned in one place, also serves as a peer review repository in which everyone can comment on everyone's work.
All articles are pull requests, and as such have issues. Everyone can comment on these issues and put inline notes in both text and code.
Things have been a bit slow, however - peer review isn't happening nearly as intensely as I would like it to be.
If you would like to help out with peer review and help make sure we only publish the highest quality content, please let me know, give me your Github username, and after I make sure you're qualified to give your opinion (you need to have at least some open source work behind you) I'll invite you to the repo. Note that you'd be doing this only for the karma points, I can't pay you to peer review and the only thing you get out of it is a sense of satisfaction brought forth by the knowledge that you helped improve a publicly available resource. In time, there will be badges, achievements and actual points, if that floats your boat, but unless you're an author as well as reviewer, there's little concrete benefit to be gained from this.