The worst language I've ever written commercial web sites in is called OOiS-Script. You can't release memory, there is no such thing as an array, functions doesn't exist, there is no scope, when you handle XML you have to strip all namespaces because it uses ':' as the indicator for trasversal, there is no XPath so you have to loop through the levels and with a mere 3000 files processed one after another you can run out of memory on a machine with 4 gig of ram because the memory is not released until the request is done, etc.

I've done some really nice stuff with this language. But it's still utter shit in so many ways it's painful. PHP is in many ways a lot better, but has some pretty fundamental flaws that still marks it as really bad. He did however, not say one thing about the developers that use PHP, so why would you slam him for that?