PHP atan () function
Examples
By atan () function returns the arctangent of different numbers:
<?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));
?>
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));
?>
Running instance »
Definition and Usage
atan () function returns the arc tangent of arg, the return value is a number between -Pi / 2 and Pi / 2 between.
grammar
atan( arg );
参数 | 描述 |
---|---|
arg | 必需。规定要处理的参数。 |
technical details
return value: | arc tangent of arg in radians. |
---|---|
Return type: | Float |
PHP version: | 4+ |
PHP Math Reference