The one I quoted is a yes/no question only if you ignore the norm of answering "Can anybody recommend [thing]?" as if it were "What examples of [thing] do you know of?". That's obviously the intention behind the question -- if you asked your waiter "Can you recommend a wine?", and s/he replied only "yes", that'd make hir both pedantic and deliberately unhelpful.

And the existence of the other questions is beside the point -- the title of the question is "Good examples of PHP code for an intermediate PHPer?", the body is merely exposition. I only quoted the equivalent question from the body because it had better grammar than the title.