PHP

PHP error: "Cannot pass parameter 2 by reference"

The simplest way to put this into perspective for memorization by behavior (in terms of PHP):

bindParam: reference
bindValue: variable

in my case i used bindValue;

mysql Cannot pass parameter 2 by reference

$variabel = 0; //make a variabel to pass parameter
$update->bindParam(":anAttrInQuery", $variabel);