phpの配列内オブジェクトから特定のメソッドの値を配列で取得

array_map(function($obj){return $obj->getId();}, $array);

例

<?php

class Hi
{
    protected $_id = 0;

    public function getId()
    {
        return $this->_id;
    }

    public function setId($id)
    {
        $this->_id = $id;
    }
}

$hi = new Hi;
$hi3 = clone $hi2 = clone $hi;
$hi->setId(1);
$hi2->setId(2);
$hi3->setId(3);
$hiList = array($hi, $hi2, $hi3);

$map = array_map(function($obj){return $obj->getId();}, $hiList);

var_dump($map);
#array(3) {
#  [0] =>
#  int(1)
#  [1] =>
#  int(2)
#  [2] =>
#  int(3)
#}

もっと簡単な書き方無いかな