deg2rad

(PHP 4, PHP 5)

deg2rad — Converts the number in degrees to the radian equivalent

float deg2rad ( float $number )

This function converts number from degrees to the radian equivalent.

The radian equivalent of number

Example #1 deg2rad() example


<?php

echo deg2rad(45); // 0.785398163397
var_dump(deg2rad(45) === M_PI_4); // bool(true)

?>

add a note User Contributed Notes deg2rad

christian dot ubu at NOSPAMHERE dot gmail dot com 13-Mar-2009 01:18


Never use deg2rad() in loops, use $rad = ($deg * M_PI / 180) instead which is faster!

john dot navratil at sbcglobal dot net 11-Feb-2007 12:32


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.