html - PHP login using CodeIgniter -

i'm trying login on php using codeigniter.

my code this:

login view

<div class="section section_with_padding" id="usuarios">          <h1>acceso usuarios</h1>          <div class="half left">             <h4>usuario existente</h4>             <p>si posee una cuenta en garage, introduzca su nombre de usuario y contraseña para acceder.</p>             <div id="login">                  <!-- usado para que muestre los errores de validacion -->                  <form method="post" name="users" action="index.php/verificarlogin">                     <div class="left">                         <label for="username">nombre de usuario:</label>                          <input name="username" type="text" class="required input_field" id="username" maxlength="30" required/>                     </div>                     <div class="right">                                                    <label for="password">contraseña:</label>                          <input name="password" type="password" class="validate-email required input_field" id="email" maxlength="30" required/>                     </div>                     <div class="clear"></div>                     <input type="submit" class="submit_btn float_l" name="submit" id="submit" value="entrar" />                 </form>             </div>         </div> 

don't mind right div, code still not coded...

my verificarlogin (verify login) controller

<?php if ( ! defined('basepath')) exit('no direct script access allowed');  class verificarlogin extends ci_controller {  function __construct() {     parent::__construct();     $this->load->model('usuarios','',true); }  function index() {     //este metodo tendra las credenciales de validacion     $this->load->library('form_validation');      $this->form_validation->set_rules('username', 'username', 'trim|required|xss_clean');     $this->form_validation->set_rules('password', 'password', 'trim|required|xss_clean|callback_check_database');      if($this->form_validation->run() == false)     {             //si la validacion falla, el usuario es redireccionado la pagina de login             $this->load->view('#usuarios');     }     else     {             //si la validacion pasa, el usuario es redireccionado donde deberia ir             redirect('home_usuarios', 'refresh');     }  }  function check_database($password) {     //si la validacion de campo es exitosa, valida contra la base de datos     $username = $this->input->post('username');      //pregunta en la base de datos     $result = $this->user->login($username, $password);      if($result)     {         $sess_array = array();         foreach($result $row)         {             $sess_array = array(             'id' => $row->id,             'username' => $row->username             );             $this->session->set_userdata('logged_in', $sess_array);         }         return true;     }     else     {         $this->form_validation->set_message('check_database', 'nombre de usuario o contraseña invalida');         return false;     }   } } 

when run it gives error:

a php error encountered

severity: notice

message: undefined property: verificarlogin::$form_validation

filename: controllers/verificarlogin.php

line number: 32

the line error marking this:

$this->form_validation->set_rules('username', 'username', 'trim|required|xss_clean'); 

i have reserch , found error caused because lacks line

$this->load->library('form_validation'); 

but line in code...

the libraries database , session loaded autoload.

i don't know whan i'm doing wrong... it's code can't access libraries...

if documentation can see example:

<?php  class form extends ci_controller {    function index()   {     $this->load->helper(array('form', 'url'));      $this->load->library('form_validation');      if ($this->form_validation->run() == false)     {       $this->load->view('myform');     }     else     {       $this->load->view('formsuccess');     }   } } ?> 

and $this->form_validation , not $this->form_validation try changing name of property wanna access.

also try fix name when loading library $this->load->library('form_validation');