如何在PHP中解析这个JSON (或json外观的东西)？

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

// 访问JSON数据
echo $data->name;  // 输出：John
echo $data->age;   // 输出：30
echo $data->city;  // 输出：New York

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

// 访问JSON数据
echo $data['name'];  // 输出：John
echo $data['age'];   // 输出：30
echo $data['city'];  // 输出：New York

$json = '{"name":"John", "age":30, "city":"New York"';
$data = json_decode($json);

if ($data === null) {
    echo "JSON解析失败：" . json_last_error_msg();
}