您的查询有两个问题...

There are two issues with your query...

在位置"部分和p_stock上缺少的分隔符之前，您还有一个逗号.

You Have one extra comma before the Where Section and your missing delimeters on p_stock.

应该是: "p_stock = '" . $_POST["updateProductStock"] . "' " 和 . "WHERE id='" . $_GET['id'] . "'";