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A PHP Error was encountered

Severity: Notice

Message: Undefined index: userid

Filename: views/question.php

Line Number: 191

Backtrace:

File: /var/www/html/cnasolution/application/views/question.php
Line: 191
Function: _error_handler

File: /var/www/html/cnasolution/application/controllers/Questions.php
Line: 419
Function: view

File: /var/www/html/cnasolution/index.php
Line: 315
Function: require_once

I know that you can declare the main() method in C in a variety of ways, including int main(void). However, I know that some functions before main are called to initialize certain values and call main. However, some of these functions call main with the parameters passed to the command line, despite main being void. How the the process still run?

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