如何在php中解码以下url

我试图解码以下网址，但我不能得到结果

{"main_cat":[{"main_cat_id":"1","main_cat_name":"Door"},{"main_cat_id":"2","main_cat_name":"Sunmica"}]}

我尝试了以下代码，请告诉我哪里做错了

<?php
    include("connect.php");
    $response['main_cat'] = array();
    $json = file_get_contents("http://localhost//Project/Fashion/select_main_cat.php");
    $dat["main_cat"] = json_decode($json);
    foreach ($dat["main_cat"] as $key->$val ) {
        ?>
    <td><?php
        echo $dat["main_cat"]->$key;

    ?></td>
    <?php
}
?>

错误：

解码

{"main_cat": [{"main_cat_id": "1", "main_cat_name": "Door"}, {"main_cat_id": "2", "main_cat_name": "Sunmica"}]}

会给你一个这样的东西

$dat = {
  main_cat:
    [
        {
           main_cat_id: 1
           main_cat_name: Door
        },
        {
           main_cat_id: 2
           main_cat_name: Sunmica
        }
    ]
}

所以你可以这样迭代：

$dat = json_decode($json);
foreach ($dat["main_cat"] as $key => $val ): ?>
    <td>
        <?php echo $val->main_cat_name; ?>
    </td>
<?php endforeach;?>

"main_cat":
    |
    |--("main_cat_id: 1", "main_cat_name: Door")
    |
    |--("main_cat_id: 2", "main_cat_name: Sunmica") 

$dat["main_cat"] = json_decode($json);
foreach ($dat["main_cat"]->main_cat as $cat ) {
    foreach ($cat as $key => $val) {
        ?><td><?php echo $key . ': ' . $val ?></td><?php
    }
}

$dat=json\u decode（$json）；
foreach（$dat[“main_cat”]作为$key=>$val）：？>

您收到的JSON字符串的结构如下：

$dat = json_decode($json);
foreach ($dat["main_cat"] as $key => $val ): ?>
    <td>
        <?php echo $val->main_cat_name; ?>
    </td>
<?php endforeach;?>

"main_cat":
    |
    |--("main_cat_id: 1", "main_cat_name: Door")
    |
    |--("main_cat_id: 2", "main_cat_name: Sunmica") 

$dat["main_cat"] = json_decode($json);
foreach ($dat["main_cat"]->main_cat as $cat ) {
    foreach ($cat as $key => $val) {
        ?><td><?php echo $key . ': ' . $val ?></td><?php
    }
}

因此，在这个JSON的顶部可以找到

“main_cat”

对象，它包含另外两个对象的数组

解析所有键及其相对值的代码如下所示：

$dat = json_decode($json);
foreach ($dat["main_cat"] as $key => $val ): ?>
    <td>
        <?php echo $val->main_cat_name; ?>
    </td>
<?php endforeach;?>

"main_cat":
    |
    |--("main_cat_id: 1", "main_cat_name: Door")
    |
    |--("main_cat_id: 2", "main_cat_name: Sunmica") 

$dat["main_cat"] = json_decode($json);
foreach ($dat["main_cat"]->main_cat as $cat ) {
    foreach ($cat as $key => $val) {
        ?><td><?php echo $key . ': ' . $val ?></td><?php
    }
}

$dat[“main_cat”]=json_decode（$json）；
foreach（$dat[“main_cat”]->main_cat作为$cat）{
foreach（$cat as$key=>$val）{
？>这是从url检索到的值吗？抱歉，我有点不清楚您是在尝试解码url还是从url返回的JSON。我是新手，正在学习JSON编码和解码。
foreach（$dat[“main_cat”]as$key=>$val）
您是否收到任何错误？尊敬的，@War10ck..是的，我从url检索到了值，如上所述，我只是显示结果。。