再问红包算法，之前的有bug，@jxycyflm，@
http://bbs.csdn.net/topics/391001579
之前的帖子在此。
两位的算法都是有问题的。
版主给出的修订版，每当红包数量是单数的时候就不对了。加起来不等于总数。
恳请两位大侠帮忙修正。
------解决思路----------------------
$r = distribute(100, 31);
echo array_sum($r), php_eol;
print_r($r);
function distribute($total, $num) {
$avg = $total / $num;
$r = array_fill(0, $num, round($avg, 2));
for($i=0; $i<$num; $i+=2) {
$t = rand(1, $avg * 100) / 100;
$r[$i] -= round($t, 2);
if($r[$i] <= 0) $r[$i] = 0.01;
if(isset($r[$i+1])) $r[$i+1] += round($t, 2);
}
$r[$num-1] = $total - array_sum(array_slice($r, 0, -1));
return $r;
}
$r = distribute(100, 31);
echo array_sum($r), php_eol;
print_r($r);
function distribute($total, $num) {
$avg = round($total / $num, 2);
$r = array_fill(0, $num, $avg);
for($i=0; $i<$num; $i+=2) {
$t = rand(1, $avg * 100) / 100;
$r[$i] -= $t;
if($r[$i] =0)
$res=array_merge($res,_distribute($total-$n,$num-1,$pj,$pj-$cz));
return $res;
}
}
$ary=distribute(50,12);
print_r(array_sum($ary));
print_r($ary);

------解决思路----------------------
奉上娱乐型红包代码
function fn($total, $part, $min = 0.01) {
$res = array_fill(0, $part, $min);
$total -= $part * $min;
for($i=0; $i<$part; $i++) $total -= ($res[$i] += round($i == $part - 1 ? $total : (rand(0, $total * 100)) / 100, 2)) - $min;
return $res;
}