检查一个多维数组元素是否是数组本身 - Check if a multidimentional array element is array itself

Check if a multidimentional array element is array itself

我试图建立一个根据用户状态输出导航菜单的例程。它需要提供一个嵌套数组变量(company => role)，看起来像:

array(2) {
  ["Company 1"]=>
  array(2) {
    [0]=>
    string(3) "dir"
    [1]=>
    string(5) "manag"
  }
  ["company 2"]=>
  string(3) "dir"
}

假设一个用户可以有多个角色。

现在我的例程(简化版本，只是为了显示逻辑不起作用):

function get_menu_1  ($status) {
        foreach ($status as $company => $position) {
            $a = is_array($company); //THIS ALWAYS RETURNS FALSE this is for debugging
            echo "<br>this element is array = $a<br>"; //this is for debugging
            if (true == is_array($company)) { // THIS ALWAYS RETURNS FALSE this user in this company has multiple roles
                foreach ($company as $subcompany => $subposition) {
                    echo "<br>$subposition<br>";
                }
            } else { //its not an array, user has one role in the company
                echo "<br>$position<br>";
            }
        }
    }

输出为:

Notice: Array to string conversion in /sata2/home/users/xreact/www/cert.xreact.org/functions.php on line 393
Array
this element is array = 
dir
array(2) { ["Company 1"]=> array(2) { [0]=> string(3) "dir" [1]=> string(5) "manag" } ["Company 2"]=> string(3) "dir" }

由于某些原因，is_array()无法检查变量是否为array

你正在测试你的数组-键本身是否是数组-但它不能是。

你必须测试这个值。

foreach ($status as $company => $position) {
    echo is_array($company); //will allways be false, because the array key is a string.
    //in your examples, "Company 1" or "Company 2";
    if(is_array($position)) {
        echo "here you have your nested array";
    }
}

编辑

在站点节点上也是如此:如果稍微改进一下数据结构，就可以完全绕过检查。与将单个角色存储为字符串不同，您可以将其存储为具有一个字符串元素的数组——因此您的array-value allways是一个数组:

$data = array(
    "Company 1"=>array("dir", "manag"),
    "Company 2"=>array("dir")
);