PHP atan2 () function
Examples
By atan2 () function returns the arc tangent of two variables:
<?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));
?>
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));
?>
Running instance »
Definition and Usage
atan2 () function returns the two variables x and y arc tangent.
grammar
atan2( y,x );
参数 | 描述 |
---|---|
y | 必需。规定被除数。 |
x | 必需。规定除数。 |
technical details
return value: | y / x arctangent, in radians, whose value is between -Pi and Pi. |
---|---|
Return type: | Float |
PHP version: | 4+ |
PHP Math Reference