Definition and Usage
定义和用法
The deg2rad() function converts a degree to its radian number.
deg2rad()函数的作用是:将角度转换为弧度。
Syntax
语法
Parameter参数 | Description描述 |
degree_number | Required. Specifies the degree to convert 必要参数。指定需要转换的角度对象 |
Example 1
案例1
<?php
echo deg2rad("30") . "<br />";
echo deg2rad("10") . "<br />";
echo deg2rad("1587") . "<br />";
echo deg2rad("70");
?> |
The output of the code above will be:
上述代码将输出下面的结果:
0.523598775598
0.174532925199
27.6983752292
1.2217304764 |
Example 2
案例2
<?php
$deg = 180;
$rad = deg2rad($deg);
echo "$deg degrees is equal to $rad radians";
?> |
The output of the code above will be:
上述代码将输出下面的结果:
180 degrees is equal to 3.14159265359 radians |