PHP Mysqli Bind_result

Question

我有一条错误线- Fatal error: Call to a member function bind_param() on a non-object in...这是我的代码：

function data () {
        $getid = 'SELECT wid FROM chii WHERE email = ?';
        $stmt = $this->conn->prepare($getid);
        $stmt->bind_param('s', $this->email);
        $stmt->execute();
        $stmt->store_result();
        $stmt->bind_result($this->wid);
    }

Answer 1

首先，将反引号放在table周围-这是保留字。