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PHP atan2() Function

< PHP Math Reference

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));
?>

Definition and Usage

The atan2() function returns the arc tangent of two variables x and y.

Syntax

atan2(y,x);

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