Question

我有一个数组$order_mealsInfo_ids，其值如此

[{"meal_id":"33"},{"meal_id":"34"}]

meal_id＆＃34; 33＆＃34;和＆＃34; 34＆＃34;具有相同的值（store_name，franchise_id，order_datetime）所以我只想获得这些值，这就是我使用distinct keyword的原因。我想在我的查询中使用$order_mealsInfo_ids，我的查询是：< / p>

    $get_franchise_info="Select distinct store_name,franchise_id,order_datetime from order_main where id 
IN (".implode(',',$order_mealsInfo_ids['meal_id']).")";

但它给出了这个错误：

注意：未定义的索引：第94行的C：\ xampp \ htdocs \ learning \ service \ get_pending_orders_news.php中的meal_id

警告：implode（）：在第94行的C：\ xampp \ htdocs \ learning \ service \ get_pending_orders_news.php中传递的参数无效

Answer 1

在您的情况下，$order_mealsInfo_ids不是PHP数组。它是一个包含JSON数组的字符串。

请试试这个：

$order_mealsInfoJSON = '[{"meal_id":"33"},{"meal_id":"34"}]';
$order_mealsInfoArr = json_decode($order_mealsInfoJSON); // Convert JSON string to PHP array containing objects.

$order_mealsInfoIds = array();
foreach($order_mealsInfoArr as $order_mealsInfo) {
    $order_mealsInfoIds[] = $order_mealsInfo->meal_id;
}

$get_franchise_info="Select distinct store_name,franchise_id,order_datetime from order_main where id IN (".implode(',', $order_mealsInfoIds).")";

Answer 2

<强> [{＆＃34; meal_id＆＃34;：＆＃34; 33＆＃34;}，{＆＃34; meal_id＆＃34;：＆＃34; 34＆＃34;}] 这不是数组这是 json

您需要将 json转换为数组

`$array = json_decode($json);
$mapedarray = array_map('current',$array);
$data = implode(',',$mapedarray);
echo $data;
`

所以你得到33,34

`
 $get_franchise_info="Select distinct store_name,franchise_id,order_datetime from order_main where id 
IN (".implode(',',$mapedarray).")";
`

或

 `
     $get_franchise_info="Select distinct store_name,franchise_id,order_datetime from order_main where id 
    IN (".$data.")";
    `

Answer 3

使用此

    $data_jsn = '[{"meal_id":"33"},{"meal_id":"34"}]';
    $data = json_decode($data_jsn,true);
    $data_val = array_map(function($element) {
      return $element['meal_id'];
    }, $data);

    $get_franchise_info="Select distinct store_name,franchise_id,order_datetime from order_main where id 
    IN (".implode(',',$data_val).")";

在php中的where子句中使用数组

3 个答案: