Cannot pass parameter 2 by reference error in php PDO -

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I'm getting the error: Can not go into context with parameter 2 .....

In this line ... 

  $ stmt1- & gt; Dam (': value', $ _SESSION ['quantity'. $ I] * $ _SESSION ['value'. $ I], PDO :: PARAM_STR);

What's wrong with the code above ??

It expects the second parameter is a variable that can be passed from context. Assume that $ stmt1 is a PDO statement, such as BindParam

Unlike the PDOSTattement :: Bind value (), the variable is bound as a reference And only PDOStatement :: execute () is evaluated on time.

Your second ultimate one expression is ( $ _ session ['quantity'. $ I] * $ _SESSION ['value'. $ I] ) A variable Not because you want to evaluate the expression now, I think you should use bindValue () instead.


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