And here's the explanation for the initial change of the php.conf:
http://blog.famillecollet.com/post/2013/01/13/PHP-and-Apache-SetHandler-vs-AddHandler
No need to downgrade. The problem is the corrupted php.conf file in the 5.3.26 update RPM. Just add these lines at the top and everything runs as smooth as always. They forgot to load the mod_php module:
#
# PHP is an HTML-embedded scripting language which attempts to make it
# easy for...