我想插入用户注册的时间:
function InsertUserToSql()
...
$stmt = $this->dbh->prepare("INSERT INTO users
(username, password, email, regdate) VALUES
(:username,:password, :email, :regdate)");
$stmt->bindParam(':username', $this->Username);
$stmt->bindParam(':password', $this->Password);
$stmt->bindParam(':email', $this->Email);
$stmt->bindParam(':regdate', time()); // this line shows the error
$stmt->execute();
...
错误:Strict standards: Only variables should be passed by reference