PHP Math functions is_nan

bool is_nan ( float $input )
$inputRequired : Number to check.
The output is TRUE if $input is 'not a number', else False.

We can check a input or variable is a number or not by using is_nan function. Note that we can't check a string with this function.
We can check square root of a negative number with is_nan function. Here is a sample code to check.

$v = acos(1.1);
echo "this is not a number";
echo "this is a number";
Out put is
this is not a number
You can change the line $v=acos(1.1) with different values of variable $v and see the result.
$v=5.23; // this is a number
$v=4; // this is a number

Subscribe to our YouTube Channel here


* indicates required
Subscribe to plus2net

    Post your comments , suggestion , error , requirements etc here .

    We use cookies to improve your browsing experience. . Learn more
    HTML MySQL PHP JavaScript ASP Photoshop Articles FORUM . Contact us
    ©2000-2022 All rights reserved worldwide Privacy Policy Disclaimer