How to send and get data by using flash messages in the codeigniter.This is simple and passing data using array.But if you reload/refresh the page, your data may not be displayed.Because data passing using flash message.However you can pass huge of data through this method.

$userDetails = array();  // declare the array
$userDetails['id'] = 10;
$userDetails['user_name'] = 'John';
$userDetails['amount'] = $250;
//create flash message
$this->session->set_flashdata('UserData', $userDetails);

You can get this details like this.

// get array
$usersPaymentData = $this->session->flashdata('UserData');
// display details
echo $usersPaymentData['id'];
echo $usersPaymentData['user_name'];
echo $usersPaymentData['amount'];
// simply
print_r($usersPaymentData);

Same way as simply,
In the controller.

$myArr = array('value 1', 'value 1');
$this->session->set_flashdata('myArray', $myArr);

View file

print_r($this->session->flashdata('myArray'));

If your flash messages are not working, then you must read this post.
Codeigniter flash message doesn’t work