mysqli_stmt::bind_param() expected to be a reference, value given in C:\xxxx\htdocs\xxxxx\xxxxx\class.mysql.php:51 Stack trace: #0 C:\xxxx\htdocs\xxxxx\xxxxx\class.mysql.php(51): ReflectionMethod->invokeArgs(Object(mysqli_stmt), Array) #1 C:\xxxx\htdocs\xxxxx\xxxxx\index.php