Re: Calculation error - PHP not following math hierarchi ???

On 8/3/05, Rene Brehmer <piv@metalbunny.net> wrote: > I've run into a situation where PHP is way off when doing a relatively > simple calculation of distance between two points in 2-dimensional space, > where coordinates go from 1 to 300 in both X and Y directions. When passing > 300, it goes back to 1, and vise-versa (it's for a game and is supposed to > approximate the movement over a sphere). > > Using this function: > > function calc_distance($curX,$curY,$newX,$newY) { > // calculate distance to new location > $distX = abs($curX - $newX); > $distY = abs($curY - $newY); > > if ($distX <= 150 && $distY <= 150) { > $dist = sqrt($distX^2 + $distY^2); I don't think you really want to do a bitwise xor there. http://www.php.net/manual/en/language.operators.bitwise.php Try pow() instead http://www.php.net/manual/en/function.pow.php -robin