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PHP Manual [is_nan]

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PHP Manual || Math Functions

(PHP 4 >= 4.2.0, PHP 5, PHP 7)

is_nanFinds whether a value is not a number

Description

is_nan ( float $val ) : bool

Checks whether val is 'not a number', like the result of acos(1.01).

Parameters

val

The value to check

Return Values

Returns TRUE if val is 'not a number', else FALSE.

Examples

Example #1 is_nan() example

<?php
// Invalid calculation, will return a 
// NaN value
$nan acos(8);

var_dump($nanis_nan($nan));
?>

The above example will output:

float(NAN)
bool(true)

See Also



PHP Manual || Math Functions