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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/site/application/views/question.php
Line: 191
Function: _error_handler

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

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

name Punditsdkoslkdosdkoskdo

PHP registered users cannot login [closed]

if($_POST["adi"]!="" and $_POST["sifre"]!="") {     $adi=$_POST["adi"];     $sifre=$_POST["sifre"];               if($db->exec("SELECT uye_adi,uye_sifre FROM uye WHERE uye_adi='$adi', uye_sifre='$sifre'"))   {      echo '';   }  else{      echo '';  }  } 

cannot be input even if the user is registered. Login failed! can you help me?

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