Re: Weird results of "=="

Jasper Bryant-Greene wrote:

Am I missing something really obvious here?

This is an inherent problem with floating-point operations, especially comparison, and is not unique to PHP. Often numbers will be off by some miniscule amount, just enough to make them not equal. What I would do in this situation is create a function float_equals(), after deciding what delta is acceptable for your situation, like this: define('MAX_FLOAT_DELTA', 0.001); // Or whatever is acceptable for you function float_equals($a, $b) {

    return (abs($a - $b) <= MAX_FLOAT_DELTA);

} Then use float_equals($x, $y) instead of $x == $y. Jasper Couldn't have said it better!

Evert