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PHP Quiz PHP CertificatePHP is_nan() Function
Complete PHP Math Reference
Definition and Usage
The is_nan() function returns true if the specified value is "not a number", otherwise it returns nothing.
Syntax
is_nan(x)
| Parameter | Description |
|---|---|
| x | Required. The value to check |
Example
<?php
echo is_nan(200) . "<br />";
echo is_nan(acos(1.01));
?>
echo is_nan(200) . "<br />";
echo is_nan(acos(1.01));
?>
The output of the code above will be:
1
Complete PHP Math Reference
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