What is a reason of placing boolean or null before comparison operator?

Question

In PHP, what is an underlying reason of placing either boolean or null before identical comparison operator?

false === $value;   
null === $value;
         


        

Answer 1

It's supposed to be quicker, but I can't lay a hand on an authority saying this with a simple Google search. See:

http://forums.phpfreaks.com/topic/222939-is-there-a-difference-between-ifvar-false-and-iffalse-var/

for one opinion.