decoct
Never use deg2rad() in loops, use $rad = ($deg * 180 / M_PI) instead which is faster!
deg2rad
(PHP 4, PHP 5)
deg2rad — 将角度转换为弧度
说明
float deg2rad
( float $number
)
本函数把 number 从角度转换成弧度。
Example #1 deg2rad()
<?php
echo deg2rad(45); // 0.785398163397
var_dump(deg2rad(45) === M_PI_4); // bool(true)
?>
参见 rad2deg()。
add a note
User Contributed Notesdeg2rad
christian dot ubu at NOSPAMHERE dot gmail dot com
13-Mar-2009 03:18
13-Mar-2009 03:18
john dot navratil at sbcglobal dot net
11-Feb-2007 03:32
11-Feb-2007 03:32
This does a simple scaling with the results that deg2rad(720) is 4PI. For navigation purposes you may wish to mod the results with 2PI.