关于日常收费计算的代码逻辑（php）,该怎么处理

关于日常收费计算的代码逻辑（php）
假设，有A,B,C三个人住在一起，需要开发一个网站来记录他们日常花费，比如买菜等等。那么数据表该怎么设计呢？另外这些数据怎么运算到每个人总共要付出多少钱呢？
以下是我的代码：
//$aData里面的每个数组表示每天的消费记录, money:当天总费用，  mean：人均费用 ，其他的表示 用户名 ： 1/0/-1 付钱人/不用付/要付钱人
$aData = [
 ['money' => 30, 'mean'=> 10, 'twl' => 1, 'xxx' => -1, 'yyy' => -1],  
 ['money' => 10, 'mean'=> 5, 'twl' => -1, 'xxx' => 1, 'yyy' => 0],
];
$count = 0;
$aList = [];
foreach($aData as $val){
foreach($val as $k => $v){
if($k == 'money'){
$count += $val['money'];
}elseif($k != 'mean' && $k != 'boss'){
$aList[$k][] = [
'out' => $v > 0 ? $val['money'] : 0,     //表示自己付出的钱
'in' => $v  'who' => $val['boss'],
];
}
}
}

$aData = [];
foreach($aList as $k => $v){
$in = $out = 0;
foreach($v as $key => $val){
$in += $val['in'];
$out += $val['out'];
}
$aData[$k] = [
'out' => $out,
'in' => $in,
];
}

结果是

这样还是不能知道 到底谁付钱给谁。求教
------解决思路----------------------
你可以一笔一笔的算

$aData = [<br /> ['money' => 30, 'mean'=> 10, 'twl' => 1, 'xxx' => -1, 'yyy' => -1],  <br />  ['money' => 30, 'mean'=> 10, 'twl' => -1, 'xxx' => -1, 'yyy' => 1], <br /> ['money' => 10, 'mean'=> 5, 'twl' => -1, 'xxx' => 1, 'yyy' => 0],<br /> ['money' => 20, 'mean'=> 10, 'twl' => 0, 'xxx' => 1, 'yyy' => -1],<br /> ['money' => 20, 'mean'=> 10, 'twl' => 0, 'xxx' => 1, 'yyy' => -1],<br /> ['money' => 20, 'mean'=> 10, 'twl' => 0, 'xxx' => 1, 'yyy' => -1],<br />];<br />foreach($aData as $id=>$m) {<br />  $u = array_diff_key($m, ['money' => 0, 'mean' => 0]);<br />  arsort($u);<br />  foreach($u as $k=>$v) {<br />    if($v == 0) continue;<br />    if($v == 1) {<br />      $boss = $k;<br />      $r[$k][] = ['id' => $id, 'out' => $m['money']];<br />    }else {<br />      $r[$k][] = ['id' => $id, 'out' => $m['mean'], 'boss' => $boss];<br />      $r[$boss][] = ['id' => $id, 'in' => $m['mean'], 'boss' => $k];<br />    }<br />  }<br />}<br />print_r($r);

Array<br />(<br />    [twl] => Array<br />        (<br />            [0] => Array<br />                (<br />                    [id] => 0<br />                    [out] => 30<br />                )<br /><br />            [1] => Array<br />                (<br />                    [id] => 0<br />                    [in] => 10<br />                    [boss] => yyy<br />                )<br /><br />            [2] => Array<br />                (<br />                    [id] => 0<br />                    [in] => 10<br />                    [boss] => xxx<br />                )<br /><br />            [3] => Array<br />                (<br />                    [id] => 1<br />                    [out] => 10<br />                    [boss] => yyy<br />                )<br /><br />            [4] => Array<br />                (<br />                    [id] => 2<br />                    [out] => 5<br />                    [boss] => xxx<br />                )<br /><br />        )<br /><br />    [yyy] => Array<br />        (<br />            [0] => Array<br />                (<br />                    [id] => 0<br />                    [out] => 10<br />                    [boss] => twl<br />                )<br /><br />            [1] => Array<br />                (<br />                    [id] => 1<br />                    [out] => 30<br />                )<br /><br />            [2] => Array<br />                (<br />                    [id] => 1<br />                    [in] => 10<br />                    [boss] => xxx<br />                )<br /><br />            [3] => Array<br />                (<br />                    [id] => 1<br />                    [in] => 10<br />                    [boss] => twl<br />                )<br /><br />            [4] => Array<br />                (<br />                    [id] => 3<br />                    [out] => 10<br />                    [boss] => xxx<br />                )<br /><br />            [5] => Array<br />                (<br />                    [id] => 4<br />                    [out] => 10<br />                    [boss] => xxx<br />                )<br /><br />            [6] => Array<br />                (<br />                    [id] => 5<br />                    [out] => 10<br />                    [boss] => xxx<br />                )<br /><br />        )<br /><br />    [xxx] => Array<br />        (<br />            [0] => Array<br />                (<br />                    [id] => 0<br />                    [out] => 10<br />                    [boss] => twl<br />                )<br /><br />            [1] => Array<br />                (<br />                    [id] => 1<br />                    [out] => 10<br />                    [boss] => yyy<br />                )<br /><br />            [2] => Array<br />                (<br />                    [id] => 2<br />                    [out] => 10<br />                )<br /><br />            [3] => Array<br />                (<br />                    [id] => 2<br />                    [in] => 5<br />                    [boss] => twl<br />                )<br /><br />            [4] => Array<br />                (<br />                    [id] => 3<br />                    [out] => 20<br />                )<br /><br />            [5] => Array<br />                (<br />                    [id] => 3<br />                    [in] => 10<br />                    [boss] => yyy<br />                )<br /><br />            [6] => Array<br />                (<br />                    [id] => 4<br />                    [out] => 20<br />                )<br /><br />            [7] => Array<br />                (<br />                    [id] => 4<br />                    [in] => 10<br />                    [boss] => yyy<br />                )<br /><br />            [8] => Array<br />                (<br />                    [id] => 5<br />                    [out] => 20<br />                )<br /><br />            [9] => Array<br />                (<br />                    [id] => 5<br />                    [in] => 10<br />                    [boss] => yyy<br />                )<br /><br />        )<br /><br />)<br /><br />