如何检查多维数组中的数组键？

Question

如何检查嵌套数组中的键是否存在？

我需要检查用户ID在数组中是否存在，我有以下找到的数组：

 Array
(

  [0] => Array
    (
        [user_id] => 1482309797
        [week] => 1
        [type] => 1
        [commission] => 4000
    )

[1] => Array
    (
        [user_id] => 1482309797
        [week] => 1
        [type] => 1
        [commission] => 0
    )

[2] => Array
    (
        [user_id] => 1482309797
        [week] => 1
        [type] => 1
        [commission] => 4000
    )

[3] => Array
    (
        [user_id] => 1482309797
        [week] => 1
        [type] => 1
        [commission] => 0
    )

[4] => Array
    (
        [user_id] => 1483096072
        [week] => 1
        [type] => 1
        [commission] => 4000
    )

[5] => Array
    (
        [user_id] => 1483333245
        [week] => 1
        [type] => 1
        [commission] => 2000
    )

我想检查用户ID是否存在，我尝试了以下代码

        foreach ($com_array as $report) {

         $user_id=$report['user_id'];

        if(array_key_exists($user_id,$output_array)){
                echo "Eid found";
         }else{
                echo "id not found";
            }

        }

有人可以帮忙吗？

这与IT技术无关。

- shamugam s

Answer 1

尝试像这样...

foreach ($com_array as $key=>$value) {
        if(array_key_exists("user_id",$value)){
                echo "id found";
         }else{
                echo "id not found";
            }

        }

- Hikmat Sijapati

Answer 2

  foreach ($com_array as $report) {
     if(isset($report['user_id'])){
         echo "Eid found";
     }else{
         echo "id not found";
     }
  }

尝试上面的代码，你将得到输出。

- Ankit Vadi

Answer 3

没有多维数组的内置函数。您可以自己创建一个，例如：

function findKey($array, $keySearch)
{
    foreach ($array as $key => $item) {
        if ($key == $keySearch) {
            echo 'yes, it exists';
            return true;
        }
        else {
            if (is_array($item) && findKey($item, $keySearch)) {
               return true;
            }
        }
    }

    return false;
}

- Mayank Pandeyz

Answer 4

如果您只是想检查一个键是否存在，可以这样做。

$user_id_arr = array_column($output_array, 'user_id'); // Get your user_id to a single dimension array
foreach ($com_array as $report) {
    if ( in_array($report['user_id'], $user_id_arr) ){
        echo "ID Found";
    } else {
        echo "ID Not Found";
    }
}

谢谢！

- masterFly