在检查空值php时,减少在数组中使用foreach

2023年8月15日 87次阅读

我有一个像下面这样的多维数组：

 $data = array (
        'department1' =>array(
            'user1' => array(
                'building1' => array(
                    'room1' => array(
                        'active' =>'false'
                    ),
                    'room2' => array(
                    )
                ),
                'building2' => array(
                    'room4' => array(
                    ),
                    'room3' => array(
                    )
                ),
            )
        )
    );

我想要做的是检查房间是否为空.如果为null,我应该设置一个值active =>测试.
我到目前为止所做的代码是：

 foreach($data as $departments => $department){
      foreach ($department as $users => $user){
         foreach($user as $buildings => $building) {
            foreach($building as $key => $value){
                  if ($data[$departments][$users][$buildings][$key] == null) {
                  $data[$departments][$users][$buildings][$key]['active'] = 'test';
                  }
            }

         }
      }
    }

它正在工作,但我想知道是否有一种最好的其他方式来实现它而不需要太多的foreach.

我的输出是：

 Array
 (
[department1] => Array
    (
        [user1] => Array
            (
                [building1] => Array
                    (
                        [room1] => Array
                            (
                                [active] => false
                            )

                        [room2] => Array
                            (
                                [active] => test
                            )

                    )

                [building2] => Array
                    (
                        [room4] => Array
                            (
                                [active] => test
                            )

                        [room3] => Array
                            (
                                [active] => test
                            )

                    )

            )

    )

)
有帮助吗？谢谢.

最佳答案 使用以下递归函数,该函数接受并通过引用返回值(可以与任何项深度/层次结构一起使用)：

function &checkRoom(&$data) {
    foreach ($data as $k => &$v) {
        if (strpos($k, "room") === 0 && empty($v)) $v = ["active" => "test"];
        if (is_array($v)) checkRoom($v);
    }
    return $data;
}

$data = checkRoom($data);
print_r($data);

输出：

Array
(
    [department1] => Array
        (
            [user1] => Array
                (
                    [building1] => Array
                        (
                            [room1] => Array
                                (
                                    [active] => false
                                )

                            [room2] => Array
                                (
                                    [active] => test
                                )
                        )

                    [building2] => Array
                        (
                            [room4] => Array
                                (
                                    [active] => test
                                )

                            [room3] => Array
                                (
                                    [active] => test
                                )

                        )
                )
        )
)
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