打印一個，兩個的組合的值，和三維陣列

Question

我有多維數組的這種組合，但我不能打印正確的值在屏幕上，

$parent = array(
    array(
     'function_name' => 'home', 
     'screen_name' => 'Home' 
     ), 

    array(
     'function_name' => 'categories', 
     'screen_name' => 'Categories', 


     array(
      'function_name' => 'post', 
      'screen_name' => 'Post', 
      ) 
     ), 

    array(
     'function_name' => 'pages', 
     'screen_name' => 'Pages', 


     array(
      'function_name' => 'add', 
      'screen_name' => 'Add', 

      array(
       'function_name' => 'manage', 
       'screen_name' => 'Manage' 
       ) 
      ) 
     ) 
); 

某些陣列有的是用sub數組，有的子數組有subsub數組。

foreach($parent as $index => $item) 
{ 
    echo 'parent - '.$item['screen_name'].'<br/>'; 

    foreach($item as $child) 
    { 
     echo 'child - '.$child['screen_name'].'<br/>'; 

     foreach($child as $grandchild) 
     { 
      echo 'grandchild - '.$grandchild['screen_name'].'<br/>'; 
     } 
    } 
} 

錯誤信息，

Warning: Invalid argument supplied for foreach() in -> foreach($child as $grandchild) 

我尋找的是這樣的結果，

parent - Home 
parent - Categories 
    child - Post 
parent - Pages 
    child - Add 
    grandchild - Manage 

編輯：

我用這個測試下方嘗試，

foreach ($system as $inner_1) { 

    if (is_array($inner_1)) 
    { 

     foreach ($inner_1 as $inner_2) 
     { 

      if (is_array($inner_2)) 
      { 
        foreach ($inner_2 as $inner_3) 
        { 
        var_dump($inner_3['function_name']); 
        } 
      } 
     } 
    } 
} 

但我得到一個奇怪的結果，

string 'p' (length=1) // don't know why I get this. 
string 'P' (length=1) // don't know why I get this. 

string 'a' (length=1) // don't know why I get this. 
string 'A' (length=1) // don't know why I get this. 

string 'manage' (length=6) // correct result. 

Answer 1

當運行$parent[1]foreach($item as $child)，$child採用以下值：'home'，'Home'和陣列。

保持數組完全關聯怎麼樣？

$parent = array(
    array(
     'function_name' => 'categories', 
     'screen_name' => 'Categories', 
     'children' => array(
      array(
       'function_name' => 'post', 
       'screen_name' => 'Post' 
      ), 
      array(
       'function_name' => 'review', 
       'screen_name' => 'Review', 
       'children' => array(
        ... 
       ) 
      ), 
     ) 
    ) 
); 

這樣你就可以運行foreach ($item['children'] as $child)知道參數是一個數組（你需要確保$item['children']存在，並且是一個數組）。