Question

下面的PHP代码适用于从wamp服务器查询数据并返回要在XML页面中使用的JSON对象。

JSON数组应包含该项目的描述，价格，数量和图像。

如何回显包含从$ row2和$ row3中检索到的数据的JSON？

谢谢

<?php 
session_start(); 
if(isset($_SESSION["userID"]))
{
//echo $_SESSION["userID"];
?>

<body>
<?php
include("connection_manager.php");

$query1="Select * from cart where userid='".$_SESSION["userID"]."'";
$result1=mysql_query($query1);
$row1=mysql_fetch_array($result1);

$query2="Select * from store where itemid='".$row1['itemid']."'";
$result2=mysql_query($query2);
$row2=mysql_fetch_array($result2);

$query3="Select * from photos where itemID='".$row1['itemid']."'";
$result3=mysql_query($query3);
$row3=mysql_fetch_array($result3);

?>

Answer 1

将关联数组输出为JSON，使用json_encode

输出描述$ row2的JSON：

echo json_encode($row2);

您还需要将Content-Type标头设置为application / json。

Answer 2

我会使用表连接将其简化为返回单个数组的单个查询，然后在该数组上使用json_encode（请参阅http://www.php.net/manual/en/function.json-encode.php）

可能类似以下内容：

$userId = $_SESSION['userID'];
$query = "SELECT store.*, photos.* 
            FROM cart 
            INNER JOIN store ON store.itemid = cart.itemid
            INNER JOIN photos ON photos.itemid = cart.itemid
            WHERE cart.userid='$userId'";
echo json_encode(mysql_fetch_array(mysql_query($query)));

话虽如此，请参阅这篇文章，了解为何不使用mysql_函数： Why shouldn't I use mysql_* functions in PHP?

- 编辑 - 以下是使用SQLite的示例;您可以将其更改为匹配您要使用的数据库：

$db = new SQLite3("db.db");

$query = "SELECT store.description, store.price, store.quantity, photos.photo_url
            FROM cart
            INNER JOIN store ON store.item_id = cart.item_id
            INNER JOIN photos ON photos.item_id = cart.item_id
            WHERE cart.user_id=1;";
$results = $db->query($query);
$full_array = array();
while ($row = $results->fetchArray())
{
    $full_array[] = $row;
}
echo json_encode($full_array);

输出：

[
{
    "0": "a",
    "1": 1,
    "2": 1,
    "3": "/images/photo_1.jpg",
    "description": "a",
    "price": 1,
    "quantity": 1,
    "photo_url": "/images/photo_1.jpg"
},
{
    "0": "b",
    "1": 2,
    "2": 2,
    "3": "/images/photo_2.jpg",
    "description": "b",
    "price": 2,
    "quantity": 2,
    "photo_url": "/images/photo_2.jpg"
},
{
    "0": "c",
    "1": 3,
    "2": 3,
    "3": "/images/photo_3.jpg",
    "description": "c",
    "price": 3,
    "quantity": 3,
    "photo_url": "/images/photo_3.jpg"
},
{
    "0": "d",
    "1": 4,
    "2": 4,
    "3": "/images/photo_4.jpg",
    "description": "d",
    "price": 4,
    "quantity": 4,
    "photo_url": "/images/photo_4.jpg"
},
{
    "0": "e",
    "1": 5,
    "2": 5,
    "3": "/images/photo_5.jpg",
    "description": "e",
    "price": 5,
    "quantity": 5,
    "photo_url": "/images/photo_5.jpg"
}
]

返回JSON对象

2 个答案: