PHP - reversed order in if statement

Question

This is a question that is bugging me for a long time and can\'t find any answer... Noticed it\'s used quite a lot by Zend Framework Developers,

What is the differen

Answer 1

If you accidentally write:

if (null = $this->user) { ... }   

you will get a syntax error.

If you accidentally write:

if ($this->user = null) { ... }

you will be searching for a reason of strange behavior of your application for a long time.