Question

I am researching possibilities of using memcached as a session storage for a system built on CodeIgniter. Has anybody done this before(that’s probably a stupid question 🙂 and if so what’s your experience folks? Have you used any existing libraries/extensions?
As far as performance improvement what have you seen? Any caveats?

Answer 1

Having PHP put the sessions into Memcache directly, rather than through framework code is easy – it’s just changing two lines in the PHP.ini:

# see http://php.net/manual/en/memcache.ini.php
session.save_handler = memcache
session.save_path="tcp://127.0.0.1:11211?persistent=1&weight=1&timeout=1&retry_interval=15"

This uses the slightly older (but still entirely supported) ‘memcache’ extension from PECL.