PHP和mySQLi:当使用prepare语句时，我还需要检查用户输入吗?

如果我在mySQLi中使用prepare语句，我还需要转义或以任何方式检查用户输入吗?例如，如果我的代码是:

$members = new mysqli("localhost", "user", "pass", "members");
$r_email = $_POST['r_email'];
$check = $members->prepare("select user_id from users where email = ?");
$check->bind_param('s', $r_email);
$check->execute();
$check->store_result();
if ($check->num_rows > 0) {
    echo "user already registered";
    $check->close();
}
$members->close();

我是否需要将$r_email = $_POST['r_email']改为$r_email = mysql_real_escape_string($_POST['r_email']);

谢谢。