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@ 2014-11-17T21:49:21Z

<?php

function a($value) {
    return is_nan($value) ? null : $value;
}

function b($value) {
    return is_float($value) && is_nan($value) ? null : $value;
}

function meh($value) {
    var_dump(a($value) === b($value));
}

foreach (array(0, NAN, "asdf", 2.4) as $value) {
    meh($value);
}

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
is_nan: documentation ( source)

preferences:dark modelive preview

61.36 ms | 402 KiB | 5 Q