IT. Expert System.

PHP

Finds whether a value is not a number


is_nan

(PHP 4 >= 4.2.0, PHP 5)

is_nanFinds whether a value is not a number

Description

bool is_nan ( float $val )

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



Content

Android Reference

Java basics

Java Enterprise Edition (EE)

Java Standard Edition (SE)

SQL

HTML

PHP

CSS

Java Script

MYSQL

JQUERY

VBS

REGEX

C

C++

C#

Design patterns

RFC (standard status)

RFC (proposed standard status)

RFC (draft standard status)

RFC (informational status)

RFC (experimental status)

RFC (best current practice status)

RFC (historic status)

RFC (unknown status)

IT dictionary

License.
All information of this service is derived from the free sources and is provided solely in the form of quotations. This service provides information and interfaces solely for the familiarization (not ownership) and under the "as is" condition.
Copyright 2016 © ELTASK.COM. All rights reserved.
Site is optimized for mobile devices.
Downloads: 286 / 248377491. Delta: 0.00550 с