PDO INSERT警告：PDOStatement :: execute（）[pdostatement.execute]：SQLSTATE [HY093]：参数号无效：参数未在

Question

当我运行此代码时：

$req = $conn->query('SELECT max(id_work) FROM work');
$res = $req->fetchColumn();
$current_id = $res['id_work'];

$desired_dir="images/work/" . $max . "-" . $_POST['title'] . "/";

$req = $conn->prepare('INSERT INTO screenshot(link_screenshot, id_work) 
                              VALUES (:link, :id_work)');
$req->execute(array(
                    'link_screenshot' => $desired_dir . "/" . $file_name,
                    'id_work' => $current_id));  //Line where I get from the error

我收到此错误：

  

警告：PDOStatement :: execute（）[pdostatement.execute]：SQLSTATE [HY093]：参数号无效：参数未在C：\ wamp \ www \ pcqsp-scratch \ admin.php中定义82

第82行：'id_work' => $current_id));

你对此有任何想法吗？谢谢:)）