“I have a rule of thumb that says if an article on how to do something in WordPress is more than a year old, it’s probably out of date and if it’s more than two years old it’s definitely out of date. And if it’s got code and it’s more than a year old it is absolutely out of date. You don’t have to write all this code out: there’s one function call you can make .”
– Mike Little
WordPress co-founder