I am getting both modules listed as installed / configured when I use: php -m or if I use: php -i but when I use: $m = new Memcache; // or $m = new Memcache(); // or $m = new Memcached(); //or $m = new Memcached; I get the following error: Fatal error: Class 'Memcached' not found I am running on a Mac - OS X (10.5.7) with default install of apache & php. Additionally, I have memcached running as a daemon on 127.0.0.1:11211 and libmemcache as required by the php-memcached library. I have restarted apache tons of times and even done a machine restart. Does anyone know why the modules/extensions show up in the command line but not in my phpinfo()? I am literally stumped, after 3 hours of googling, I am just about ready to give up.