Sorry, but this is mostly wrong. PHP has two awesome frameworks - Symfony and Laravel. They both have their pro's and con's, but both are very mature frameworks that can both match Rails or Django in their own rights. Both of fully tested, both have full auth libraries.

CodeIgniter does not have the largest community by any stretch, and its falling fast. If it hasn't already died, then it will in the near future.

Sorry, but based on your comment I don't think that you really know much about the PHP framework landscape.