php getting array levels in the recursion -

i have next tree-array:

$arr =  array(  'id' => 1431,  'children' => array(   1432 => array(    'id' => 1432,    'children' => array(     1433 => array(      'id' => 1433,      'children' => array(),     ),     1434 => array(      'id' => 1434,      'children' => array(),     ),    )    ),   1435 => array(),    'id' => 1435,    'children' => array(     1436 => array(      'id' => 1436,      'children' => array(       1437 => array(        'id' => 1437,        'children' => array(),       ),       1438 => array(        'id' => 1438,        'children' => array(),       ),       1439 => array(        'id' => 1439,        'children' => array(),       ),      ),     ),    ),  ), ); 

my task generations array array. output should next:

array( [1] = array(   [1432] = ...   [1435] = ... ), [2] = array(   [1433] = ...   [1434] = ...   [1436] = ... ), [3] = array(   [1437] = ...   [1438] = ...   [1439] = ... ), ) 

but output next (without 1346 element):

array( [1] = array(   [1432] = ...   [1435] = ... ), [2] = array(   [1433] = ...   [1434] = ... ), [3] = array(   [1437] = ...   [1438] = ...   [1439] = ... ), ) 

what wrong in function?

public function getgenerations($usertree, $currgeneration = 0, $result = array()) {     print_r($usertree);     $currgeneration++;     if (!empty($usertree) && !empty($usertree['children'])) {         foreach($usertree['children'] $k => $v) {             $curruser = $v;             unset($curruser['children']);             $result[$currgeneration][$k] = $curruser;             $result += $this->getgenerations($v, $currgeneration, $result);         }     }     return $result; } 

i call function this: $res = getgenerations($arr); thank in advance. sorry english.

you pass result array reference instead of returning , joining local result array:

public function getgenerations($usertree, $currgeneration = 0, &$result = array()) {     print_r($usertree);     $currgeneration++;     if (!empty($usertree) && !empty($usertree['children'])) {         foreach($usertree['children'] $k => $v) {             $curruser = $v;             unset($curruser['children']);             $result[$currgeneration][$k] = $curruser;             $this->getgenerations($v, $currgeneration, $result);         }     }     return $result; }