PHP Math functions is_nan

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

Be the first to post comment on this article :


Post Comment This is for short comments only. Use the forum for more discussions.

HTML . MySQL. PHP. JavaScript. ASP. Photoshop. Articles. FORUM Contact us
©2000-2015 All rights reserved worldwide Privacy Policy Disclaimer