PHP atan2() Function
Example
Return the arc tangent of two variables with the atan2() function:
<?php
echo(atan2(0.50,0.50) . "<br>");
echo(atan2(-0.50,-0.50) . "<br>");
echo(atan2(5,5) . "<br>");
echo(atan2(10,20) . "<br>");
echo(atan2(-5,-5) . "<br>");
echo(atan2(-10,10));
?>
Try it Yourself »
Definition and Usage
The atan2() function returns the arc tangent of two variables x and y.
Syntax
atan2(y,x);
Parameter Values
| Parameter | Description |
|---|---|
| y | Required. Specifies the dividend |
| x | Required. Specifies the divisor |
Technical Details
| Return Value: | The arc tangent of y/x in radians, which is between -Pi and Pi |
|---|---|
| Return Type: | Float |
| PHP Version: | 4+ |
❮ PHP Math Reference
