Question

我有一个数组，我想在其上添加另一个数组。目前，服务器（php）将此数组作为json数据进行响应。这是样本。

$ip = getRequestIP();
$cf = isCloudflare();

if($cf) echo "Cloudflare :D<br>";
else    echo "Not cloudflare o_0";

echo "Your actual ip address is: ". $ip;

然后这里的代码就在这里。

[{
"id":"11",
"user_id":"8000",
"product":"Shoes A",
"quantity":"1",
"date_open":"2015-01-04",
"paid":"1",
"harvested":"",
"reinvest":null,
"profit":null,
"investment":"3000"
},

{
"id":"12",
"user_id":"8000",
"product":"Shoes B",
"quantity":"1",
"date_open":"2015-03-01",
"paid":"1",
"harvested":"",
"reinvest":null,
"profit":200,
"investment":"1500"
}]

现在我想添加一个数组，它是用户投资的总和。所以我认为代码是这样的：

$userid = $_POST['user'];
$sql = "SELECT * FROM user_products WHERE uproducts_user_id = '{$userid}'";
$user_products = db::select($sql);

    $product = array();
    foreach( $user_products as $user_product){
        array_push($product, $user_product);
    }

    $server_msg = $product;

echo json_encode($server_msg);

所以上面的代码，我怎样才能实现这一点，以便服务器响应如下：

$product = array();
$total_product= 0;
foreach($user_products as $user_product){
    $total_product+= $user_product['investment']; // the sum of investment how to show this as an array?

    array_push($product, $user_product);

}   
$server_msg = $product;

Answer 1

有很多方法，但试试这个：

$server_msg = $product;
array_push($server_msg, array('total_investment' => $total_product));

这应该可以为您提供所需的输出。

Answer 2

如果您正在处理API（看起来似乎如此），我建议您将JSON的结构重新构建为：

{
  "items": [{
    "id":"11",
    "user_id":"8000",
    "product":"Shoes A",
    "quantity":"1",
    "date_open":"2015-01-04",
    "paid":"1",
    "harvested":"",
    "reinvest":null,
    "profit":null,
    "investment":"3000"
  }, ....],
  "total_investment": 45000
}

要回答您的问题，@ rexmac建议是一种方式。但是，您可能不希望混淆响应字段。如果你这样结束，肯定在客户端是丑陋的:(假设是Javascript）

for (let i = 0; i < data.length; i++) {
    if (typeof data[i].total_investment !== "undefined") {
        totalInvestment = data[i].total_investment;
        //....
    }
    //....
}

但是（方式更冷）：

let totalInvestment = data.total_investment;
for (let i = 0; i < data.items.length; i++) {
   //....
}

希望这有帮助。

将数据添加为数组

2 个答案: