PHP atan() Function
Example
Return the arc tangent of different numbers with the atan() function:
<?php
echo(atan(0.50) . "<br>");
echo(atan(-0.50) . "<br>");
echo(atan(5) . "<br>");
echo(atan(-5) . "<br>");
echo(atan(100) . "<br>");
echo(atan(-100));
?>
Try it Yourself »
Definition and Usage
The atan() function returns the arc tangent of arg as a numeric value between -Pi/2 and Pi/2 radians.
Syntax
atan(arg);
Parameter Values
| Parameter | Description |
|---|---|
| arg | Required. Specifies an argument to process |
Technical Details
| Return Value: | The arc tangent of arg in radians |
|---|---|
| Return Type: | Float |
| PHP Version: | 4+ |
❮ PHP Math Reference
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