is_nan

PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8

is_nan - Finds whether a value is not a number

Code Examples

Example #1 is_nan example

Result: float(NAN) bool(true)

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<?php
// Invalid calculation, will return a 
 
 
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Example #2 of is_nan

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<?php 
$return = is_nan(acos(8));
 
 
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is_nan

Example #1 is_nan example

Example #2 of is_nan

Function is_nan:

Mathematical Functions Functions

Most used PHP functions