类不输出

Question

我有一个没有输出的简单类：

class ICRR extends Profile {
    public $recommendation_text;
    public $comments;
    public $men_id;
    public $recommendation;
    public $uid;

    public function __construct($uid)
    {   
        include 'con.php';  

        $stmt = $conn->prepare(
            'SELECT * FROM icrr WHERE uid = :uid');
        $stmt->execute(array(':uid' => $uid));

        while($row = $stmt->fetch(PDO::FETCH_ASSOC)){
            $this->men_id = $row['men_id'];
            $this->uid = $row['uid'];
            $this->nid = $row['nid'];
            $this->recommendation = $row['reccomendation'];
            $this->comments = $row['comments'];
            $this->date_submitted = $row['date_submitted'];
        }
    }

    public function recommendation_text() {
        switch ($this->recommendation){
            case 1 :
                $this->recommendation = 'Yes Certify';
            break;
            case 2 :
                $this->recommendation = 'No Do Not Certify';
            break;
            case 3 :
                $this->recommendation = 'Certify Pending Requirements';
            break;

            default : echo "Recommendation Not Received";
        }
        return $this->recommendation_text;
    }
}

当我问：

$ICRR = new ICRR($uid);
var_export($ICRR);

一切都是空的。我检查了查询，它正在返回数据...我之前使用过这样的类，它工作正常所以我想我错过了一些我无法看到的东西..