在php中编译嵌套的JSON数组

Question

我想发送嵌套的JSON数组。它包含以下格式。

${"posts":[{
    "abc":"123",
    "xyz":"123",
    "pro":[{
        "name":"Brinjal",
        "qty":"500 gms"
    },
    {
        "name":"Brinjal",
        "qty":"500 gms"
    }] 
}]
}

这是我的php代码：

$rows = $stmt->fetchAll();
if ($rows) {
     $order["posts"]   = array();
    foreach ($rows as $row) {
        $post = array();
        $post["order_id"] =  $row["order_id"];
        $post["order_totalamount"] = $row["order_totalamount"];
        $post["address"] = $row["address"];
        $post["pincode"] = $row["pincode"];
        $post["delivery_timeslot"] = $row["delivery_timeslot"];
        $post["order_date"] = $row["order_date"];
        $query1= "query";
        $rows1 = $stmt->fetchAll();
        if ($rows1) {
            foreach ($rows1 as $row1) {                             
                $query2= "query";
                $rows2 = $stmt->fetchAll();
                $post["product"]   = array();   
                if ($rows2) {
                    $products = array();
                    foreach ($rows2 as $row2) {
                        $products["product_name"]=$row2["product_name"];
                        $products["prod_qty"] = $row2["product_minquantity"];
                    }
                    array_push($post["product"],$products);
                    echo json_encode($products);
                }

            }
          }
        array_push($order["posts"], $post);
    }  
    echo json_encode($order);   
}

从上面的代码我得到了结果：

$ {"posts":
    [{
    "order_id":"18",
    "order_totalamount":"40",
    "address":"2, Chetan Society, Vadodara",
    "pincode":"390023",
    "delivery_timeslot":"Zone wise delivery",
    "order_date":"2016-03-18 17:50:53",
    "product":[{"product_name":"Brinjal","prod_qty":"500 gms"}]
    }]
}

但我的实际产品数组是：

${"product_name":"Banana","prod_qty":"1 Kg"}{"product_name":"Brinjal","prod_qty":"500 gms"}

请帮忙。我被困在上面了。尝试了很多，但没有成功。

Answer 1

在

            foreach ($rows2 as $row2) {
                $products["product_name"]=$row2["product_name"];
                $products["prod_qty"] = $row2["product_minquantity"];
            }

您使用上一个$products["product_name"]的值覆盖$products["prod_qty"]和$row2。

行{"product_name":"Banana","prod_qty":"1 Kg"}{"product_name":"Brinjal","prod_qty":"500 gms"}实际上由两个回声组成：

1. {"product_name":"Banana","prod_qty":"1 Kg"}
2. {"product_name":"Brinjal","prod_qty":"500 gms"}

但你没有看到差异。我建议在它们之间回显一个字符串，或使用var_dump()之类的字符串来查看你回显的值。

您应该执行以下操作：

        for ($i = 0; $i < count($rows2); $i++) {
            $products[$i]["product_name"]=$rows2[$i]["product_name"];
            $products[$i]["prod_qty"] = $rows2[$i]["product_minquantity"];
        }

这将导致：[{"product_name":"Banana","prod_qty":"1 Kg"},{"product_name":"Brinjal","prod_qty":"500 gms"}]

仅供参考$array[] =与array_push()具有相同的结果，但调用array_push()的开销较小。

修改 下面是一个完整的例子，因为它似乎不适合你：

//Demo $order
$order = array (
    'posts' => 
    array (
        0 => 
        array (
            'order_id' => '18',
            'order_totalamount' => '40',
            'address' => '2, Chetan Society, Vadodara',
            'pincode' => '390023',
            'delivery_timeslot' => 'Zone wise delivery',
            'order_date' => '2016-03-18 17:50:53',
        ),
    ),
);

//Demo $rows2
$rows2 = array(
    array(
        'product_name' => 'banana', 
        'product_minquantity' => '1 Kg'
    ),
    array(
        'product_name' => 'Brinjal', 
        'product_minquantity' => '500 gms'
    )
);

$post['product'] = array();   
if ($rows2) {
    $products = array();
    for ($i = 0; $i < count($rows2); $i++) {
        $products[$i]['product_name'] = $rows2[$i]['product_name'];
        $products[$i]['prod_qty']     = $rows2[$i]['product_minquantity'];
    }
    $post['product'] = $products;
    echo json_encode($products); //[{"product_name":"banana","prod_qty":"1 Kg"},{"product_name":"Brinjal","prod_qty":"500 gms"}]
}
//$order['posts'][] = $post;
$order['posts'][0] = $order['posts'][0] + $post;
//In this example I only have 1 item in $order['posts'] so I know to add to key 0.
//In your case you need to know which key of $rows1 you need to do the adding.
//Change the foreach loop of $rows to a for loop as well so you can define your own keynames ($i).
echo '<br>==================================================================<br>';
echo json_encode($order);
/*
    {
    "posts":[
      {
         "order_id":"18",
         "order_totalamount":"40",
         "address":"2, Chetan Society, Vadodara",
         "pincode":"390023",
         "delivery_timeslot":"Zone wise delivery",
         "order_date":"2016-03-18 17:50:53",
         "product":[
            {
               "product_name":"banana",
               "prod_qty":"1 Kg"
            },
            {
               "product_name":"Brinjal",
               "prod_qty":"500 gms"
            }
         ]
      }
   ]
}
*/