PHP中向对象数组的每个对象动态添加新属性的教程

$quizzes = [
    (object)[
        'quiz_id' => 1033,
        'quiz_venue' => 6,
        'quiz_host' => 46,
        'quiz_golden_question' => 100,
        'quiz_golden_question_outcome' => 0,
        'quiz_running' => 1,
        'quiz_status' => 100,
        'quiz_trainee' => 0
    ],
    (object)[
        'quiz_id' => 985,
        'quiz_venue' => 57,
        'quiz_host' => 21,
        'quiz_golden_question' => 0,
        'quiz_golden_question_outcome' => 0,
        'quiz_running' => 1,
        'quiz_status' => 310,
        'quiz_trainee' => 0
    ]
];

// 错误的实现方式
foreach ($quizzes as $quiz_index => $item) { 
    $venuetitle = get_the_title($item->quiz_venue); // 假设此函数返回场地名称
    // 错误：试图将属性添加到主数组 $quizzes
    $quizzes['quiz_venue_name'] = $venuetitle; 
}

Array
(
    [0] => stdClass Object (...) // 原始对象
    [1] => stdClass Object (...) // 原始对象
    [quiz_venue_name] => '最后一个场地名称' // 错误地添加在主数组的末尾
)

// 正确的实现方式
foreach ($quizzes as $item) { 
    // 假设 get_the_title 是一个已定义的函数，根据场地ID获取名称
    $venuetitle = get_the_title($item->quiz_venue); 
    // 正确：将属性添加到当前迭代的 $item 对象中
    $item->quiz_venue_name = $venuetitle; 
}

// 示例：get_the_title 的模拟实现
function get_the_title($venue_id) {
    $venue_names = [
        6 => '中心会场',
        57 => '北部礼堂',
        // ... 其他场地ID和名称
    ];
    return $venue_names[$venue_id] ?? '未知场地';
}

Array
(
    [0] => stdClass Object
        (
            [quiz_id] => 1033
            [quiz_venue] => 6
            [quiz_host] => 46
            [quiz_golden_question] => 100
            [quiz_golden_question_outcome] => 0
            [quiz_running] => 1
            [quiz_status] => 100
            [quiz_trainee] => 0
            [quiz_venue_name] => 中心会场 // 正确添加的新属性
        )

    [1] => stdClass Object
        (
            [quiz_id] => 985
            [quiz_venue] => 57
            [quiz_host] => 21
            [quiz_golden_question] => 0
            [quiz_golden_question_outcome] => 0
            [quiz_running] => 1
            [quiz_status] => 310
            [quiz_trainee] => 0
            [quiz_venue_name] => 北部礼堂 // 正确添加的新属性
        )
)