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

Question

我使用pdo选择陈述时出错，我不明白为什么会这样做。

你觉得这里有什么不对吗？

我遇到此错误：

  

警告：PDOStatement :: execute（）：SQLSTATE [HY093]：参数号无效：参数未在$ readGallery-＆gt; execute（）;

中定义

$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

更改

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

到

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