codeigniter, set_flashdata not working - php

Question

I read on stack overflow about flash data only valid till next server request, therefore I made new flashdata for couple of message display..
here below is the my code
This is my controller Controller
public function login(){
$this->form_validation->set_rules('username','Username','required');
$this->form_validation->set_rules('password','Password','required|min_length[5]');
if($this->form_validation->run() == TRUE){
$username= $this->input->post('username');
$password= $this->input->post('password');
$this->load->model('Auth_model');
$user = $this->Auth_model->get_login();
if ($user == 0) {
//echo "<script>alert('wrong username');</script>";
$this->session->set_flashdata("msg","Username does not exists");
redirect("auth/login");
}
else{
print_r($user['username']);
if($username == $user['username'] && $password == $user['password']){
$this->session->set_flashdata("success","You are logged in");
$_SESSION['user_logged'] = TRUE;
$_SESSION['username'] = $user['username'];
redirect("user/dashboard","refresh");
}
else {
//echo "<script>alert('wrong password');</script>";
$this->session->set_flashdata("msg","Password does not match.");
redirect("auth/login");
}
}
}
$this->load->view('login_v');
}
Model
public function get_login(){
$username = $this->security->xss_clean($this->input->post('username'));
$password = $this->security->xss_clean($this->input->post('password'));
$this->db->select('*');
$this->db->from('users');
$this->db->where(array('username' => $username));
$query = $this->db->get();
$user = $query->row();
if ($this->db->affected_rows() != 1) {
return false;
}
else {
$data = array(
'user_id' => $user->user_id,
'username' => $user->username,
'password' => $user->password
);
//print_r($data);
//$this->session->set_userdata($data);
return $data;
}
}
view
<?php if(isset($_SESSION['success'])) {?>
<div class="alert alert-success"><?php echo $_SESSION['success']; ?></div>
<?php } ?>
<?php echo validation_errors('<div class="alert alert-danger">', '</div>'); ?>
<?php $this->session->flashdata('msg');?>
<form action="" method="POST">
<div class="form-group">
<label for="username">Username</label>
<input type="text" class="form-control" name="username" id="username">
</div>
<div class="form-group">
<label for="password">Password:</label>
<input type="password" class="form-control" name="password" id="password">
</div>
<div>
<button class="btn btn-primary" name="login">Login</button>
</div>
</form>
I want to display
$this->session->set_flashdata("msg","Username does not exists");
but my if else is just doing redirect, the commented script tag works fine though.
How to make "msg" work?
Thanks in advance.

Answer 1

please add echo statement in the view like
<?php echo $this->session->flashdata('msg');?>
OR
<?=$this->session->flashdata('msg')?>

Answer 2

It should be like this :
Get your flashdata by using its key, Should be like this
<?php if(!empty($this->session->flashdata('msg'))) {?>
<div class="alert alert-danger">
<?php echo $this->session->flashdata('msg'); ?>
</div>
<?php } ?>
Or simply do like this:
<div class="alert alert-success"><?php echo $this->session->flashdata('msg'); ?></div>
For more : https://www.codeigniter.com/user_guide/libraries/sessions.html