php false place in condition

Question

Usually comparing with false is done like this where false is on right side:

if(strpos($str, 'php') !== false) {
    // code
}

But I have also noticed at various places false on left side:

if(false !== strpos($str, 'php')) {
    // code
}

As far as I understand, they are same then why some people put false on left side? Is there anything special about it, something I am missing ?

Answer 1

Thats something inattentive developers invented

The "problem"

if ($var = false) { /* code */ }

The solution

if (false = $var) { /* code */ }

Latter one will fail and thus the developer sees, that he misses an additional =, !, ... here