in reply to Insert into database table
One thing that leaps out at me is that you're using both bind_param() and passing a value to execute(). Unless you absolutely have to, don't use bind_param.
Also, you aren't using strict, which means you're not seeing the fact that you never declare or assign to $niin ... that, I suspect, is your problem.
Suggested solution: Comment out the call to bind_param().
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