php - my query doesn't work -


i making login script connected database

"undefined variable: dbusername in f:\xamp\register\login\functions.php on line 21"

i have further checked , saw query doesn't work can guys me?

if (isset($_post['sub']))  {    include_once("connect.php");      $username = strip_tags($_post['username']);     $password = strip_tags($_post['password']);        $sql = "select id, username, password login username = '$username' limit 1";        $query = mysqli_query($dbcon, $sql);        if ($query) {         $row = mysqli_fetch_row($query);         $userid = $row[0];         $dbusername = $row[1];         $dbpassword = $row[2];       }       if ($username == $dbusername && $password == $dbpassword) {         $_session['username'] = $username;         $_session['id'] = $userid;         header('location: login.php');       } else {         echo "incorrect username or password.";        }     }

you need use condition inside if($query), dont think there need recheck because checking in query where username = $username. have modified code as:

modified code:

  $sql = "select id, username, password login username = '$username' limit 1";   $query = mysqli_query($dbcon, $sql);   if (!$query) {     die(mysqli_error($dbcon));   }   else   {     $count = mysqli_num_rows($query); // check total no of rows      if ($count > 0)      {         session_start(); // start session         $row = mysqli_fetch_row($query);         $userid = $row[0]; // userid database         $dbusername = $row[1]; // username database         $_session['username'] = $dbusername;         $_session['id'] = intval($userid);         header('location: login.php');             die(); // using die() after header()     }     else{         echo "incorrect username or password."; // if query not return print this.     }     }

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