selfmade login with sql database in php isnt working -


i made login website , isn't working, here code:

session_start();  ini_set('display_errors', 'on'); error_reporting(-1);  include 'php/dbconnection.php';       if($_session['logged'] == true) {     header("location: computer.php");     exit; }  if(isset($_post['login-submit'])) {     $username = $_post['username'];     $sql_filter="select * `tbluser` username = '$username'";       $_session['filter'] = $sql_filter;     $page_query = mysqli_query($con, $_session['filter']);     //$page_nums = mysqli_num_rows($page_query);       //var_dump $page_query;      while ($obj = mysqli_fetch_object($page_query))      {                //if($page_nums == 1)         //{              $password=md5($_post['password']);                if($_post['username'] == $obj->username , $password == $obj->password)             {                  $_session['username'] = $obj->username;                 $_session['userid'] = $obj->userid;                 $_session['nachname'] = $obj->nachname;                 $_session['vorname'] = $obj->vorname;                 $_session['email'] = $obj->email;                 $_session['logged']   = true;                 $http_session_vars['filter'] = "";                 mysqli_close($con);                 header("location: computer.php");                 exit;             }                        //}          }     header("location: index.php");     exit; } else {     header('location: 404.html');     exit; }         mysqli_close($con); 

the variables posted php 1 via login-submit button. problem figured out pag_nums variable empty @ point need it. friend of mine used login own page 1:1 , works him. dont see error, pls me find :d


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