GoLang is_nan

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PHP is_nan

PHP original manual for is_nan [ show | php.net ]

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

is_nan — Finds whether a value is not a number

bool is_nan ( float $val )

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

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

Example #1 is_nan() example


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

var_dump($nan, is_nan($nan));
?>

The above example will output:

float(NAN)
bool(true)