2 回答
TA贡献1155条经验 获得超0个赞
求和的最快方法是索引数组,像这样
$products = array();
foreach ($bills as $bill) {
$key = $bill['product_id'];
if (isset($products[$key])) {
$products[$key]['total'] += $bill['total'];
} else {
$products[$key] = $bill;
}
}
var_dump($products);
输出
array(2) {
[1]=>
array(3) {
["bill_id"]=>
string(1) "1"
["product_id"]=>
string(1) "1"
["total"]=>
int(80)
}
[2]=>
array(3) {
["bill_id"]=>
string(1) "2"
["product_id"]=>
string(1) "2"
["total"]=>
int(70)
}
}
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foreach($products as $key=>$bill) {
var_dump($bill);
}
TA贡献1872条经验 获得超3个赞
最简单的方法是单遍循环。
$byProduct = [];
foreach($bills as $bill)
{
$key = $bill['product_id'];
if (!isset($byProduct[$key])) {
$byProduct[$key] = [
'product_id' => $key,
'total' => 0
];
}
$byProduct[$key]['total'] += $bill['total'];
}
结果var_dump($byProduct):
array(2) {
[1] =>
array(2) {
'product_id' =>
string(1) "1"
'total' =>
int(80)
}
[2] =>
array(2) {
'product_id' =>
string(1) "2"
'total' =>
int(70)
}
}
另一种方法是使用array_walk,但在复杂性方面几乎相同:
$byProduct = [];
array_walk($bills, function(&$bill) use (&$byProduct) {
$key = $bill['product_id'];
if (!isset($byProduct[$key])) {
$byProduct[$key] = [
'product_id' => $key,
'total' => 0
];
}
$byProduct[$key]['total'] += $bill['total'];
});
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