Display error message from Admin_Controller to any view - codeigniter

Question

I would like to be able to display data message from my Admin_Controller in the core folder core/Admin_Controller.php to then show up on my login view.
I can only seem to get it working with session flash data but would not like to use flash data.
So what would be best method on getting the $data['error_warning'] message to from my Admin_Controller to be able to work on my Login controller and view.
<?php
class Admin_Controller extends MX_Controller {
public function __construct() {
parent::__construct();
$this->load->library('user');
Modules::run('admin/error/permission/check');
$ignore = array(
'login',
'logout'
);
if (!in_array($this->router->fetch_class(), $ignore)) {
if ($this->session->userdata('user_id') == FALSE) {
$data['error_warning'] = 'You have tried to directly access controller without logging on! Please login.';
redirect('admin');
}
}
}
}
Login Controller:
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
class Login extends Admin_Controller {
private $error = array();
public function __construct() {
parent::__construct();
$this->load->library('form_validation');
}
public function index() {
$data['title'] = 'Administration';
if (isset($this->error['warning'])) {
$data['error_warning'] = $this->error['warning'];
} else {
$data['error_warning'] = '';
}
$username = $this->input->post('username');
if (isset($username)) {
$data['username'] = $username;
} else {
$data['username'] = '';
}
$password = $this->input->post('password');
if (isset($password)) {
$data['password'] = $password;
} else {
$data['password'] = '';
}
$this->form_validation->set_rules('username', 'Username', 'required|callback_validate');
$this->form_validation->set_rules('password', 'Password', 'required');
if ($this->form_validation->run($this) == FALSE) {
$this->load->view('template/common/login.tpl', $data);
} else {
redirect('admin/dashboard'.'/'.$token);
}
}
public function validate() {
$this->load->library('user');
if ($this->user->login() == FALSE) {
$this->form_validation->set_message('validate', '<i class="fa fa-exclamation-triangle"></i> Does not match any of our database records!');
return false;
} else {
return true;
}
}
}
Login View
<?php echo Modules::run('admin/common/header/index');?>
<div class="container">
<div class="row">
<div class="col-lg-8 col-lg-offset-2 col-md-8 col-md-offset-2 col-sm-10 col-sm-offset-1 col-xs-12">
<div class="panel panel-default" style="margin-top: 12.5%;">
<div class="panel-heading"><strong><i class="fa fa-key"></i> Enter Details To Login </strong></div>
<div class="panel-body">
<?php echo validation_errors('<div class="alert alert-danger">', '</div>'); ?>
<?php $data = array('class' => 'form-horizontal');?>
<?php echo form_open('admin', $data);?>
<?php if ($error_warning) { ?>
<div class="alert alert-danger text-center"><i class="fa fa-exclamation-triangle"></i> <?php echo $error_warning; ?>
<button type="button" class="close" data-dismiss="alert">×</button>
</div>
<?php } ?>
<?php if ($this->session->flashdata('error')) { ?>
<div class="alert alert-danger text-center"><i class="fa fa-exclamation-triangle"></i> <?php echo $this->session->flashdata('error'); ?>
<button type="button" class="close" data-dismiss="alert">×</button>
</div>
<?php } ?>
<div class="form-group">
<?php $data = array('class' => 'col-sm-2 control-label');?>
<?php echo form_label('Username', 'username', $data);?>
<div class="col-sm-10">
<?php
$data_username = array(
'id' => 'username',
'name' => 'username',
'class' => 'form-control',
'placeholder' => 'Username',
'value' => $username
)
;?>
<?php echo form_input($data_username);?>
</div>
</div>
<div class="form-group">
<?php $data = array('class' => 'col-sm-2 control-label');?>
<?php echo form_label('Password', 'password', $data);?>
<div class="col-sm-10">
<?php
$data_password = array(
'id' => 'password',
'name' => 'password',
'class' => 'form-control',
'placeholder' => 'Password',
'value' => $password
)
;?>
<?php echo form_password($data_password);?>
</div>
</div>
<div class="text-right">
<button type="submit" class="btn btn-primary">Login Now</button>
</div>
</div>
<div class="panel-footer text-right">
Not registered on admin ?
click here
<?php echo form_close();?>
</div>
</div>
</div>
</div>
<?php echo Modules::run('admin/common/footer/index');?>

Answer 1

Try defining a class properties in your Admin_Controller, like this:
<?php
class Admin_Controller extends MX_Controller {
// Change here
protected $ignore;
protected $data;
public function __construct() {
parent::__construct();
$this->load->library('user');
Modules::run('admin/error/permission/check');
$this->ignore = array(
'login',
'logout'
);
if (!in_array($this->router->fetch_class(), $ignore)) {
if ($this->session->userdata('user_id') == FALSE) {
$this->data['error_warning'] = 'You have tried to directly access controller without logging on! Please login.';
redirect('admin');
}
}
}
}
Also, as above, change each reference to either $data or $ignore to be $this->data or $this->ignore. You'll also need to do this inside your Login class too. Always, when referencing class properties (that is, variables declared outside a method within a class), you do so by $this->PROPERTY_NAME.