Kusoknogi

$tree[]=array('age'=>180,'name'=>'Дуб');
	$tree[]=array('age'=>500,'name'=>'Ольха');
	$tree[]=array('age'=>150,'name'=>'Береза');
	$tree[]=array('age'=>480,'name'=>'Клён');
	$tree[]=array('age'=>390,'name'=>'Тополь');
$age  = array_column($tree, 'age');
$name = array_column($tree, 'name');
	array_multisort($age, SORT_ASC,$name, SORT_ASC, $tree);