我如何用PHP写一个像这样的JSON文件呢？

$data = array(
    "name" => "John Doe",
    "age" => 30,
    "email" => "johndoe@example.com"
);

$jsonString = json_encode($data);

$file = 'data.json';
file_put_contents($file, $jsonString);

$data = array(
    "name" => "John Doe",
    "age" => 30,
    "email" => "johndoe@example.com"
);

$jsonString = json_encode($data);

$file = 'data.json';
file_put_contents($file, $jsonString);