How to Check either Session is Set or Not in Codeigniter? - php

Question

I know how to create session in core PHP, and I have understand how to do this in codeigniter, but I am unable to understand how to check, if the session is set or not? I have tried to check this through View but it always give me the meesage Please Login.
Kindly tell me how can I check whether the session is Set or not Set
Controller
if ($user_type=='Student')
{
if ($LoginData= $this->loginmodel->studentLogin($username,$password))
{
foreach($LoginData as $UserId)
{
$currentId= $UserId->StudentId;
}
//[[session]]
$data['students_data']= $this->loginmodel->student_profile($currentId);
$this->session->userdata('$data');
$this->load->view('students',$data);
}
else
{
//$data['message']= array('Invalid Username or Password');
$this->load->view('Login');
echo "Invalid Username or Password";
}
}
elseif ($user_type=="Faculty")
{
if($data['faculty_data']=$this->loginmodel->faculty_admin($username, $password))
{
$this->session->userdata('$data');
$this->load->view('faculty');
}
else
{
$this->load->view('Login');
echo "Invalid Username or Password";
}
}
VIEW
<?php
if (!$this->session->userdata('$data'))
{
echo "Please Login";
}
else
{
}
?>
<!DOCTYPE

Answer 1

Creating Session:
$newdata = array(
'username' => 'johndoe',
'email' => 'johndoe#some-site.com',
'logged_in' => TRUE
);
$this->session->set_userdata($newdata);
or
$this->session->set_userdata('some_name', 'some_value');
But before that ensure that you have the session library included.
$this->load->library('session');
Get Session Data:
if($this->session->userdata('whatever_session_name_is')){
// do something when exist
}else{
// do something when doesn't exist
}

Answer 2

if ($this->session->userdata('variable') !== FALSE) {
echo 'Variable is set';
} else {
echo 'Variable is not set';
}
More info
Demo code

Answer 3

Using has_userdata
if ($this->session->has_userdata('username')) {
return TRUE;
} else {
return FALSE;
}