PHP is_nan() Function
Definition and Usage
is_nan() determines whether a value is a valid number.
Syntax
is_nan(x)
| Parameter | Description |
|---|---|
| x | Required. Specifies the value to be checked. |
Description
If x Returns true for 'non-numeric', such as the result of acos(1.01).
Example
<?php echo is_nan(200); echo is_nan(acos(1.01)); ?>
Output:
1
