Question

php二维数组求和

Array
(
[0] => Array
(
[order_num] => 2013031802
[cid] => 54
[order_ip] => 125.76.225.1
[order_amo] => 1200
[end_time] => 1366819200
[order_end] => 1394467200
)

[1] => Array
(
[order_num] => 2013041001
[cid] => 54
[order_ip] => 117.34.17.64
[order_amo] => 300
[end_time] => 1366819200
[order_end] => 1394467200
)

[2] => Array
(
[order_num] => 2013041602
[cid] => 57
[order_ip] => 117.34.17.64
[order_amo] => 440
[end_time] => 1366732800
[order_end] => 1395676800
)

[3] => Array
(
[order_num] => 2013041901
[cid] => 58
[order_ip] => 117.34.17.64
[order_amo] => 360
[end_time] => 1394467200
[order_end] => 1396281600
)

[4] => Array
(
[order_num] => 2013041902
[cid] => 59
[order_ip] => 117.34.17.64
[order_amo] => 3000
[end_time] => 1395676800
[order_end] => 1397836800
)

[5] => Array
(
[order_num] => 2013042401
[cid] => 54
[order_ip] =>
[order_amo] => 30000
[end_time] => 1366819200
[order_end] => 1366732800
)

[6] => Array
(
[order_num] => 2013042501
[cid] => 79
[order_ip] => 192.168.1.1
[order_amo] => 2300
[end_time] => 1366819200
[order_end] => 1366819200
)

[7] => Array
(
[order_num] => 2013042502
[cid] => 79
[order_ip] =>
[order_amo] => 10000
[end_time] => 1366819200
[order_end] => 1366819200
)

)
当CID相同的时候把amo加起来，ip拼接起来（ip不相同的时候，ip不为空），写成一个新的数组

Answer 1

$new = array();
foreach($array as $value){
//新的cid号存一个新的数组
if(empty($new[$value['cid']])){
$new[$value['cid']] = $value;
//存储IP进入数组，方便后续判断
$new[$value['cid']]['ip'] = array($value['order_ip']);
}else{
//累加amo的值
$new[$value['cid']]['order_amo'] += $value['order_amo'];
//判断IP是否为空或者是否重复
if(!empty($value['order_ip']) && !in_array($value['order_ip'],$new[$value['cid']])){
//拼接ip，并添加到IP数组，方便后续判断
$new[$value['cid']]['order_ip'] .= ','.$value['order_ip'];
$new[$value['cid']]['ip'] = array($value['order_ip']);
}
}
}