Alvaro Videla has submitted a new post from his blog today that looks at caching in PHP applications, specifically with APC or memcached.

Sometimes when talking with developers I see that there are some misconceptions regarding this two caching systems. That's why I'd like to share some concepts I've learned along the way.

Alvaro looks at both technologies and describes what they're good at and two of the main misconceptions about them - that APC doesn't mean caching data and that using memcached isn't faster than working with local values (you still have to make the TCP round trip).