1.2.663. Manipulates NaN

This code handles Not-a-Number situations. Not-a-Number, also called NaN, happens when a calculation can’t return an actual float.

<?php

// acos returns a float, unless it is not possible.
$a = acos(8);

var_dump(is_nan($a));

?>

See also Floats.

1.2.663.1. Suggestions

• Add the third argument, and set it to true

1.2.663.2. Specs

Short name	Php/IsNAN
Rulesets	All, Appinfo, CE, Changed Behavior
Exakat since	0.10.6
PHP Version	All
Severity	Minor
Time To Fix	Quick (30 mins)
Precision	Very high
Features	float
Available in	Entreprise Edition, Community Edition, Exakat Cloud