再问红包算法，之前的有bug，@JXYCYFLM，@,该怎么处理

$r = distribute(100, 31);
echo array_sum($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) $r[$i] = 0.01;
    if(isset($r[$i+1])) $r[$i+1] += $t;
  }
  $r[$num-1] = $total - array_sum(array_slice($r, 0, -1));
  return $r;
}

function distribute($total,$num){
	return _distribute($total,$num,$total/$num/2,0);
}
function _ceil($i){
	return ((int)($i*100))/100;
}
function _distribute($total,$num,$pj,$last_c){
	if($num==0){
		return array();
	}
	else if($num==1){
		return array($total);
	}
	else {		
		$cz=_ceil(mt_rand(-$pj*100,$pj*100)/100);
		$n=_ceil($pj+$cz+$last_c);
		$res[]=$n;
		if($num-1>=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);

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;
}