DTOをイテレーションさせたいとき

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<?php
class TestA implements Iterator {
    private $arr = [
        "name"=>"konishi",
        "age"=>43,
        "sex"=>"man"
    ];

    public function rewind(){
        echo "****** rewind() ******\n";
        reset($this->arr);
    }
    public function key(){
        echo "****** key() ******\n";
        return key($this->arr);
    }
    public function current(){
        echo "****** current() ******\n";
        return current($this->arr);
    }
    public function next(){
        echo "****** next() ******\n";
        next($this->arr);
    }
    public function valid(){
        echo "****** valid() ******\n";
        return !is_null(key($this->arr));
    }
}

$test = new TestA();
foreach($test as $d) {
    print($d."\n");
}
?>