如何使用PHP获取json解码数组值

$jsonString = '{"name":"John", "age":30, "city":"New York"}';
$data = json_decode($jsonString, true);
$name = $data['name'];
$age = $data['age'];
$city = $data['city'];

$jsonString = '{"name":"John", "age":30, "city":"New York"}';
$data = json_decode($jsonString);
$name = $data->name;
$age = $data->age;
$city = $data->city;

$jsonString = '[{"name":"John", "age":30, "city":"New York"}, {"name":"Jane", "age":25, "city":"London"}]';
$data = json_decode($jsonString, true);
foreach ($data as $item) {
    $name = $item['name'];
    $age = $item['age'];
    $city = $item['city'];
    // 进行相应的操作
}