Which PHP (opcode) cache one should use and why?

The products you list serve different purposes. OPCode caches There are many PHP Accelerators (OPCaches) as seen on this Wikipedia list. As is common with open source products, they are all fairly similar. XCache is the lighttp PHP accelerator, and is the default choice when you are running that HTTPd. It works well with Apache … Read more

memcache vs memcached?

The short answer: Either one is what you are looking for, but my first choice would be memcache (the first one you listed), purely based on its correct use of nomenclature. Now here’s how I came to that conclusion: Here is a quick backgrounder in naming conventions (for those unfamiliar), which explains the frustration by … Read more