We need a dependency checker for PHP! Something where you can theme it up easily, select what is needed, run the script and be done with it. There are many examples of this for the many great open source PHP applications out there, but we need a generic script, something PEAR-ish.
I guess in some ways using PEAR to check dependencies is sort of counter-intuitive, as most folks who need to check for dependencies would probably not be familiar with PEAR. Nonetheless, it is a good coding style.