PHP is_nan() Function, Math Functions

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PHP is_nan() - Math Functions

Tutorials »Php »

Topic

What is an is_nan Function?

Explanation

The "is_nan()" function finds whether a value is not a number.

Syntax:

    is_nan(x)

In the above syntax "x" is the value to check whether the given value is a number.

Example:

    <?php
    echo is_nan(400). "<br />";
    echo is_nan(acos(8));
    ?>

Result::

In the above example the first value is "400" its a number it returns "1", since cos(8) is not a number it returns nothing.

A Note

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