Question

I was reading a PHP book about operators.

And the book says that if(!$a == $b) is faster then if($a != $b).
Is this true?

I have tried this with MS but with no results. What do you think?

EDIT:
if($a != $b) is faster then if(!$a == $b)

Answer 1

Over 1,000,000 iterations, I found that if( $a != $b) is about 40% slower than if( !$a == $b), however this difference is only about 0.04 nanoseconds, and they are NOT equivalent.

$a = "123";
$b = 456;
var_dump(
    $a != $b, // true
    !$a == $b // false
);