检查多维数组元素是否为数组本身

问题描述：

I'm trying to build a routine which outputs nav menu depending on user status. It needs to be fed a nested array variable (company => role) which looks like:

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

It is assumed, that a user can have multiple roles.

Now my routine (simplified version, just to show the logic isnt working):

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>";
            }

        }

    }

The output is:

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" }

For some reason is_array() fails to check whether the variable is array.

我正在尝试构建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的数组变量（company =＆gt; role），它看起来像： p>

  array（2）{
 [“Company 1”] =＆gt;  
 array（2）{
 [0] =＆gt; 
 string（3）“dir”
 [1] =＆gt; 
 string（5）“manag”
} 
 [“公司2  “] =＆gt; 
 string（3）”dir“
} 
  code>  pre> 
 
 假设用户可以拥有多个角色。 p>  
 
 
现在我的例程（简化版，只是为了显示逻辑不起作用）： p> 
 
 
  function get_menu_1（$ status）{
 
 foreach（  $ status as $ company =＆gt; $ position）{
 $ a = is_array（$ company）;  //总是返回FALSE这是调试
 echo“＆lt; br＆gt;这个元素是array = $ a＆lt; br＆gt;”;  //这是用于调试
 if（true == is_array（$ company））{//总是返回FALSE这个公司的用户有多个角色
 
 foreach（$ company as $ subcompany =＆gt; $ subposition  ）{
 echo“＆lt; br＆gt; $ subposition＆lt; br＆gt;”; 
} 
} else {//它不是数组，用户在公司中有一个角色
 
 echo“＆lt; br＆gt; $ 位置＆lt; br＆gt;“; 
} 
 
} 
 
} 
   code>  pre> 
 
 输出为： p> 
 
 
 注意：第393行/sata2/home/users/xreact/www/cert.xreact.org/functions.php中的数组到字符串转换
 
Array 
 
这个元素是array = 
 
dir  
array（2）{[“Company 1”] =＆gt;  array（2）{[0] =＆gt;  string（3）“dir”[1] =＆gt;  string（5）“manag”} [“公司2”] =＆gt;  string（3）“dir”} 
  code>  pre> 
 
 由于某种原因， is_array（） code>无法检查变量是否为数组。 p  > 
  div>

答

you are testing if your array-key is an array itself - but it can't be.

you have to test the value instead.

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";
    }
}

edit

also, on a site node: you could circumvent the check alltogether if you improve your data structure a little bit. instead of storing a single role as string, you can store it as an array with one string element - so your array-value allways is an array:

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

检查多维数组元素是否为数组本身

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