php - 无法通过 php PDO 中的引用错误传递参数 2

Question

我收到错误: 无法通过引用传递参数 2 in.....

在这一行...

$stmt1->bindParam(':value', $_SESSION['quantity'.$i] * $_SESSION['price'.$i], PDO::PARAM_STR);   

上面的代码有什么问题？？

Answer 1

我会说这是 PDO:bindParam() 之间的典型混淆以及您可能打算使用的内容:PDO:bindValue() .

PDOStatement::bindParam

Binds a PHP variable to a corresponding named or question mark placeholder in the SQL statement that was used to prepare the statement. Unlike PDOStatement::bindValue(), the variable is bound as a reference and will only be evaluated at the time that PDOStatement::execute() is called.

PDOStatement::bindValue

Binds a value to a corresponding named or question mark placeholder in the SQL statement that was used to prepare the statement.