如何使用Php在JSON中表示一对多关系？

// 创建一个关联数组来表示学校和班级的关系
$school = array(
    'name' => 'ABC School',
    'classes' => array(
        array(
            'name' => 'Class A',
            'students' => array(
                array('name' => 'John'),
                array('name' => 'Alice')
            )
        ),
        array(
            'name' => 'Class B',
            'students' => array(
                array('name' => 'Bob'),
                array('name' => 'Emma')
            )
        )
    )
);

// 将关联数组转换为JSON格式
$json = json_encode($school);

// 输出JSON数据
echo $json;

{
    "name": "ABC School",
    "classes": [
        {
            "name": "Class A",
            "students": [
                {"name": "John"},
                {"name": "Alice"}
            ]
        },
        {
            "name": "Class B",
            "students": [
                {"name": "Bob"},
                {"name": "Emma"}
            ]
        }
    ]
}