php - PHP 组数据比较

Question

如何分组日期并计算重量总和然后放入 assoc 数组 php？

{name:"A",date:"2012-12-11",order:1,time:3,weight:10},
{name:"A",date:"2012-12-11",order:1,time:4,weight:12},
{name:"B",date:"2012-12-11",order:1,time:3,weight:17},
{name:"A",date:"2012-12-12",order:1,time:5,weight:50},
{name:"A",date:"2012-12-12",order:2,time:3,weight:70}

根据这个重量总和一天一天，但问题是如果（相同日期相同订单相同名称；哪个更大的时间占其权重，不在乎）但不同的名称或订单占组的总和。

结果必须是这样的：

{date:2012-12-11,weight:29},
{date:2012-12-12,weight:120},

有人帮忙吗？它可以像：

   {name:"A",date:"2012-12-11",order:1,time:3,weight:10}, 
    {name:"B",date:"2012-12-11",order:1,time:3,weight:17},
    {name:"A",date:"2012-12-11‌​",order:1,time:4,weight:12},
     {name:"A",date:"2012-12-12",order:1,time:5,weight:50},
     {name:"A",date:"2012-12-12",order:2,time:3,weight:70}

Answer 1

我相信有一个更简单的解决方案，但我认为这就足够了：

$json  = '[';
$json .= '{"name":"A","date":"2012-12-11","order":1,"time":3,"weight":10},';
$json .= '{"name":"A","date":"2012-12-11","order":1,"time":4,"weight":12},';
$json .= '{"name":"B","date":"2012-12-11","order":1,"time":3,"weight":17},';
$json .= '{"name":"A","date":"2012-12-12","order":1,"time":5,"weight":50},';
$json .= '{"name":"A","date":"2012-12-12","order":2,"time":3,"weight":70}]';

$orders = json_decode($json, true);

$result = array();
foreach ($orders as $row) {
    $key = $row['date'].'.'.$row['order'].'.'.$row['time'];
    $result[$key]['date'] = $row['date'];

    if (isset($result[$key]['weight'])) {

        if ($row['weight'] > $result[$key]['weight']) {
            $result[$key]['weight'] = $row['weight'];
        }
    } else {
        $result[$key]['weight'] = $row['weight'];
    }

}


$realresult = array();
foreach ($result as $row) {
    $realresult[$row['date']]['date'] = $row['date'];

    if (isset($realresult[$row['date']]['weight'])) {
        $realresult[$row['date']]['weight'] += $row['weight'];
    } else {
        $realresult[$row['date']]['weight'] = $row['weight'];
    }
}

print_r($realresult);

//Array ( [2012-12-11] => Array ( [date] => 2012-12-11 [weight] => 29 ) [2012-12-12] => Array ( [date] => 2012-12-12 [weight] => 120 ) ) 

你可以在这里试试：http ://codepad.viper-7.com/lSEhBC