I tried to add ZipArchive library so when I tried emerge dev-lang/php5 or emerge -pv dev-lang/php:5 or package dev-php5/pecl-zip and I received only errors. This could be also useful I think http://pastebin.com/m47bac4bf Reproducible: Always
It's not that useful, as you should not use pastebins for bugzillas. What exactly fails during 'emerge php' ?
Where is dev-php5/pecl-zip from? It may help to update portage (and then perhaps emerge php with "zip" in USE)...
Please prodive the requested info and re-open the bug