In a response to Richard Davey's latest post, Chris Shiflett has a new post on his blog with his take on a bit of the PHP Tips.

One of his first entries is a response to a rather poor list of PHP tips. Richard counters many of the supposed performance tips that focus on trivial details such as single quotes versus double quotes. He also mentions the importance of readability. I think this is a point that is often lost, especially for developers who seek to impress others with the complexity of their code. Personally, I feel successful when my solution to a problem is unimpressive and painfully simple.

He does mention, though, that he's more a fan of interpolation than concatination when it comes to combining strings ("foo $bar" versus "foo ".$bar) - just for the simple sake that it's more readable...