1. first Add encryption key in config.php file.

$config['encryption_key'] = "YOUR ENC KEY";

2. Load Library : $this->load->library(‘encrypt’);

3. Now you can encode/Decode Your message as Below

Encode :

$this->encrypt->encode($msg)

or 
$key = "Your more secure key";
$this->encrypt->encode($msg,$key)

Decode:

$this->encrypt->decode($msg)

or 
$key = "Your more secure key";
$this->encrypt->decode($msg,$key)

Codeigniter get affected rows insert example

$data = array(
               'id' => $id,
               'name' => $name,
               'email' => $email,
               'phone' => $phone
            );

$this->db->insert('table_name', $data);
$affected_rows = $this->db->affected_rows();

Will Return no of rows inserted.

Codeigniter get affected rows delete example

$where_array = array(
                'id'=>$id
            );

$this->db->delete('table_name', $where_array);
$affected_rows = $this->db->affected_rows();

$data = array(
               'name' => $name,
               'email' => $email,
               'phone' => $phone
            );

$this->db->where('id', $id);
$this->db->update('table_name', $data);
$affected_rows = $this->db->affected_rows();

You Can Enable Error Reporting in Codeigniter by using the following settings:
Go to the index.php file which is located at the root of your application.
And Change the environment to development as
define(‘ENVIRONMENT’, ‘development’);

    define('ENVIRONMENT', 'development');
/*
 *---------------------------------------------------------------
 * ERROR REPORTING
 *---------------------------------------------------------------
 *
 * Different environments will require different levels of error reporting.
 * By default development will show errors but testing and live will hide them.
 */

if (defined('ENVIRONMENT'))
{
    switch (ENVIRONMENT)
    {
        case 'development':
            error_reporting(E_ALL);
        break;

    case 'testing':
    case 'production':
        error_reporting(0);
    break;

    default:
        exit('The application environment is not set correctly.');
}
}

Which will solve your problem.

Codeigniter clear database cache Example

$this->db->cache_delete_all();

Will clear All cache.

Codeigniter get current ip address Example

You can get ip address using the following syntax-

$this->input->ip_address();

The above syntax will return the current user’s ip and if ip addres is invalid it returns 0.0.0.0.

The input class is automatically loaded so need not to load manually, Just use – $this->input->ip_address(); to get the ip address.

Validate Ip Address

You can validate ip address using the below syntax-

$ip = "Your_IP";
$this->input->valid_ip($ip);

Pass the IP address to validate in valid_ip() function. It will return true if IP is valid and return false if IP is invalid.

Example

Here is an example of validate ip address.

$ip ='109.77.98.92';
$isValidIp = $this->input->valid_ip($ip);
if($isValidIp){
echo "Ip is valid";
}else{
echo "Ip is Not Valid";
}

Codeigniter redirect refresh Syntax

Note : $this->load->helper(‘url’); should be loaded before redirect.

redirect("location","refresh");

Where First option is location ie . URI and second option is optional.
If you want to redirect refresh use second parameter.

Codeigniter redirect Example

redirect("/post/66","refresh");