UPDATE and Increment column value POD

Question

I'm trying to sum/add another value to the actual value in the database but this is not working. Any suggestions?

$suplies=15;
$user_id="100234";

$sql = "UPDATE table SET suplies=suplies+".$suplies." WHERE user_id=?";
$q = $conn->prepare($sql);
$q->execute(array(':suplies'=>$suplies,':user_id'=>$user_id));

Answer 1

完全使用命名的占位符即可。

$sql = "UPDATE table SET suplies = suplies + :suplies WHERE user_id = :user_id";