And I respect PHP very much for that focus. But as soon as you go beyond the very basics, I think the learning curve there is steeper. Rails simply has so many answers to so many questions, and it introduces those answers in a pretty progressive way. You don't even have to learn what SQL injection is if you're using the preferred query methods. You SHOULD learn what that is, but you don't have to to get started. If you don't know what SQL injection is and you use the MySQL db query functions with a string-interpolated query in PHP, well, you're going to be in trouble.
Probably he knows the difference