怎么让php返回对象数组

// 创建一个 Person 类
class Person {
  public $name;
  public $age;

  public function __construct($name, $age) {
    $this->name = $name;
    $this->age = $age;
  }
}

// 创建一个对象数组
$people = array(
  new Person('John', 25),
  new Person('Mary', 30),
  new Person('Tom', 20)
);

// 输出数组元素
foreach ($people as $person) {
  echo $person->name . ' is ' . $person->age . ' years old.<br>';
}

// 连接到 MySQL 数据库
$conn = mysqli_connect('localhost', 'username', 'password', 'database');

// 查询用户列表
$result = mysqli_query($conn, 'SELECT name, age FROM users');

// 创建一个对象数组
$people = array();
while ($row = mysqli_fetch_assoc($result)) {
  $person = new Person($row['name'], $row['age']);
  array_push($people, $person);
}

// 输出数组元素
foreach ($people as $person) {
  echo $person->name . ' is ' . $person->age . ' years old.<br>';
}

// 关闭数据库连接
mysqli_close($conn);

// 创建一个对象数组
$people = array(
  new Person('John', 25),
  new Person('Mary', 30),
  new Person('Tom', 20)
);

// 将对象数组转换为 JSON 格式
$json = json_encode($people);

// 输出 JSON 格式字符串
echo $json;