gentoo php update

Needed to update php to play with some recently discovered php toys.
The rebuild seemed easy enough, as usual.
But then i ran into some problems like:

PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php5/lib/php/extensions/no-debug-zts-20050922/zip.so' - /usr/lib/php5/lib/php/extensions/no-debug-zts-20050922/zip.so: cannot open shared object file: No such file or directory in Unknown on line 0

So according to some kid in the gentoo forums all you need to do is this:
equery belongs zip.so
then you'll find out to what package it belongs en remerge that package, like this
emerge dev-php5/pecl-zip
ofcourse it would be wise to check it out first with -pv before you actually merge the packages.

We really need to now these things as a webdeveloper, just so we can fool around.