operand comparison in Zend Framework source code

Question

I've been looking through Zend Framework's source code and noticed that most (if not all) comparisons are done with the operands in the reverse order I would expect:

if ((false !== $request) {
    ...
}

instead of:

if (($request !== false) {
    ...
}

What is the reason for this convention?

Answer 1

It's called a Left-Hand Comparison.

Basically, it's so that if you forget to put the second = in ==, it'll error rather change the value of the variable...