PHP deg2rad() 函数

PHP deg2rad是一个预定义函数，用于将角度转换为弧度。

语法

    float deg2rad ( float $number );    

上述给定的函数将度转换为弧度单位。

示例1

<?php
degree=15;
echo "Your degree number is : ".degree."<br>"; 
echo "By using 'deg2rad()' function, your radian equivalent is :".deg2rad($degree);
?>

输出：

Your degree number is : 15
By using 'deg2rad()' function, your radian equivalent is :0.26179938779915

示例2

<?php
degree=45;
echo "Your Degree number is : ".degree."<br>"; 
echo "By using 'deg2rad()' function, your radian equivalent is :".deg2rad($degree);
?>

输出：

Your Degree number is : 45
By using 'deg2rad()' function, your radian equivalent is :0.78539816339745

示例3

<?php
degree=45;
echo "Your Degree number is : ".degree."<br>"; 
echo var_dump(deg2rad($degree) === M_PI_4); // Return true
?>

输出:

Your Degree number is : 45
bool(true)

示例4

<?php
degree=180;
echo "Your degree number is : ".degree."<br>"; 
rad = deg2rad(degree);
echo "degree degrees is equal torad radians.";
?>

输出：

Your degree number is : 180
180 degrees is equal to 3.1415926535898 radians.