Building A Login System

   $username = stripinput($_POST['username']);
   $pass = stripinput($_POST['password']);
$result = dbquery("SELECT * FROM ".DB_MY_TABLE." WHERE active='1' AND username='$username'");
   while($data = dbarray($result)) {
      $username = $data['username'];
      $_SESSION['user'] = $username;
      $password = $data['password'];
      if(password_verify($pass, $password)) {
         $_SESSION['valid'] === true;
         }
      }
   }
   redirect(BASEDIR."my_dir/my_file.php");
}

if(isset($_POST['username']) && !empty($_POST['email']) && !empty($_POST['password'])) {
   $username = stripinput($_POST['username']);
   $email = stripinput($_POST['email']);
   $password = stripinput($_POST['password']);
      $hash = password_hash($password, PASSWORD_DEFAULT);
   $reg_time = date("Y-m-d");
   $active = 1;
$result = dbquery("INSERT INTO ".DB_MY_TABLE." (acct_id, username, email, password, reg_time, active) VALUES ('', '$username', '$email', '$hash', '$reg_time', '$active')");
   $_SESSION['valid'] === false;
   }
   redirect(BASEDIR."my_dir/login.php");
}