The latest module versions of Drupal and Typo3 now both use the solarium
library.
I think solarium is the most used PHP library for Solr and it is the most
active project.
But as one of the maintainers of the Drupal integration and the solarium
library itself, my opinion might not be totally ob
WordPress and Drupal both have ways to interface with Solr through
plugins/modules. Not sure that describes your PHP website.
I like Ruby on Rails "projectblacklight" for an easy and usable discovery layer.
We are a Python/Django shop - we've had good luck with Django-haystack and
pysolr.
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