Definition and Usage
定义和用法

The rad2deg() function converts a radian number to its degree.
rad2deg()函数的作用是：将弧度数转换为相应的角度数。

Syntax
语法

rad2deg(radian_number)

Example
案例

<?php
$rad = M_PI;
$deg = rad2deg($rad);
echo "$rad radians is equal to $deg degrees";
?>

The output of the code above will be:
上述代码将输出下面的结果：

3.14159265359 radians is equal to 180 degrees

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