Someone

function distcalc($Ax,$Ay,$Bx,$By) {

        $minsortx = min($Ax, $Bx);
        $minsorty = min($Ay, $By);
        $maxsortx = max($Ax, $Bx);
        $maxsorty = max($Ay, $By);
        $x = $maxsortx - $minsortx;
        $y = $maxsorty - $minsorty;
        $dis = (($x*$x)+($y*$y));
        $dis = sqrt($dis);
        return $dis;
        }