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
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