如何使用PHP从数组中提取特定的JSON对象

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

$name = $array['name'];
$age = $array['age'];
$city = $array['city'];

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

$name = $array['person']['name'];
$age = $array['person']['age'];
$city = $array['person']['city'];

$jsonString = '[{"name":"John", "age":30, "city":"New York"}, {"name":"Jane", "age":25, "city":"London"}]';
$array = json_decode($jsonString, true);

foreach ($array as $obj) {
    $name = $obj['name'];
    $age = $obj['age'];
    $city = $obj['city'];
    // 在这里处理每个JSON对象
}