PHP is_nan() Function Example

The is_nan() function is used to check the passed parameter is number or not.

PHP is_nan() Function Example:

The is_nan() function is used to check the passed parameter is number or not. If it return true then the passed argument is number other wise it return nothing.

Syntax:

is_nan(x)

where x is required parameter for check.

Example:

<?php
echo $return = is_nan(50) . "<br />";
echo $return = is_nan(-50). "<br />";
echo $return = is_nan(cos(5.10)). "<br />";
echo $return = is_nan(acos(5.10));
?>

After running this example the output is:

Output:

1

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