将关联数组值获取到变量中，该变量是 cookie 中的字符串格式

Question

我从字符串格式的 cookie 中获取这个关联数组类型的值 -

[{"id":"7","quantity":"3","price":1500,"title":"Shoes"},{"id":"9","quantity":"4","price":1290,"title":"Shirt"}]

var_dump($getcart);  //  return of this is(just to confirm) -

string(111) "[{"id":"7","quantity":"3","price":1500,"title":"Shoes"},{"id":"9","quantity":"4","price":1290,"title":"Shirt"}]" 

如果我将其转换为数组 -

json_encode($getcart);

将其带到另一个数组以进行进一步操作 -

$ar=array();
$ar = json_decode($getcart);

我需要帮助 -

通过其“id”获取所有值。例如。如果我按 id=7 搜索，我需要接收其值数量=3 和价格-1500 和标题鞋

我在这里尝试过但失败了-

for($i=0;$i<sizeof($ar);$i++)
{
    print_r(array_values($ar[1]));  // gives back ----> Array ( [0] => stdClass Object ( [id] => 7 [quantity] => 3 [price] => 1500 [title] => casual blue strip ) [1] => stdClass Object ( [id] => 9 [quantity] => 4 [price] => 1290 [title] => United Colors of Benetton shirt ) ) Array ( [0] => stdClass Object ( [id] => 7 [quantity] => 3 [price] => 1500 [title] => casual blue strip ) [1] => stdClass Object ( [id] => 9 [quantity] => 4 [price] => 1290 [title] => United Colors of Benetton shirt ) ) 
}

echo $ar  // gives ------> ArrayArray

这是有效的回报，但不是我想要的。这里有任何帮助来单独获取值吗？

Answer 1

使用json_decode($getcart, true);。这里json_decode() 中的true 参数将JSON 转换为数组。如果没有true 参数，它将转换为array() 的object。

$getcart = '[{"id":"7","quantity":"3","price":1500,"title":"Shoes"},{"id":"9","quantity":"4","price":1290,"title":"Shirt"}]';
$arr = json_decode($getcart, true);

print '<pre>';
foreach($arr as $val){
    print_r($val);
    //print $val['id'];
    //print $val['quantity'];
    //print $val['price'];
    //print $val['title'];
}
print '</pre>';