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<?php $pages = array(); $pages[1] = array('id' => 1, 'parent' => 0, 'name' => 'Hello World'); $pages[2] = array('id' => 1, 'parent' => 1, 'name' => 'Child of Hello World'); $pages[3] = array('id' => 1, 'parent' => 0, 'name' => 'Brother of Hello World'); $pages[4] = array('id' => 4, 'parent' => 2, 'name' => 'Grand-child of Hello World'); $pages[6] = array('id' => 6, 'parent' => 4, 'name' => 'Great-grand-child of Hello World'); $children = array(); foreach($pages as $key => $page){ $parent = (int)$page['parent']; if(!isset($children[$parent])){ $children[$parent] = array(); $children[$parent][$key] = array('id' => $page['id'], 'name' => $page['name']); } } var_dump($children);