警告：PDOStatement::execute(): SQLSTATE[HY093]: 参数号无效

Question

我在使用 pdo 选择语句时出错，我不明白发生这种情况的原因。

你觉得这里有什么问题吗？

我遇到了这个错误：

警告：PDOStatement::execute(): SQLSTATE[HY093]: Invalid parameter number: parameter is not defined in $readGallery->execute();

$delId = $_GET['delid'];
$thumb = $_GET['thumb'];
$folder = '../uploads/';
$readGallery = $pdo->prepare("SELECT * FROM gallery WHERE news_id = ?");
$readGallery->bindParam(':news_id', $delId);
$readGallery->execute();
$numGallery =   $readGallery->rowCount();

Answer 1

改变

$readGallery = $pdo->prepare("SELECT * FROM gallery WHERE news_id = ?");

到

$readGallery = $pdo->prepare("SELECT * FROM gallery WHERE news_id = :news_id");