從多維數組獲取值

Question

我有如下給出的數組結構...在這裏，我想通過動態獲取所有最終孩子的id值，因爲此數組可能有很多孩子。我如何通過動態獲得每個最終孩子的id值？
我希望值從下面陣列結構這樣

6 
7 
8 
9 
17 

Array 
(
    [0] => Array 
     (
      [id] => 1 
      [children] => Array 
       (
        [0] => Array 
         (
          [id] => 4 
          [children] => Array 
           (
            [0] => Array 
             (
              [id] => 6 
             ) 

           ) 

         ) 

        [1] => Array 
         (
          [id] => 5 
          [children] => Array 
           (
            [0] => Array 
             (
              [id] => 7 
             ) 

           ) 

         ) 

       ) 

     ) 

    [1] => Array 
     (
      [id] => 2 
      [children] => Array 
       (
        [0] => Array 
         (
          [id] => 8 
         ) 

        [1] => Array 
         (
          [id] => 9 
         ) 

       ) 

     ) 

    [2] => Array 
     (
      [id] => 3 
      [children] => Array 
       (
        [0] => Array 
         (
          [id] => 10 
         ) 

        [1] => Array 
         (
          [id] => 16 
          [children] => Array 
           (
            [0] => Array 
             (
              [id] => 17 
             ) 

           ) 

         ) 

       ) 

     ) 

) 

Answer 1

這將返回終點遞歸

function getIds($data){ 
    $out = array(); 
    if(is_array($data)){ 
      foreach($data as $elm){ 
        if($elm['children']){ 
          $out = array_merge($out,getIds($elm['children'])); 
        }else{ 
          $out[] = $elm['id']; 
        } 
      } 
    } 
    return $out; 
} 

Answer 2

易與遞歸做：

function get_final($arr) { 
    $out = array(); 
    if(is_array($arr)) { 
     foreach($arr as $a) { 
      $out = array_merge($out, get_final($a)); 
     } 
     return $out; 
    } 
    else return array($arr); 
}