Codeigniter error: Call to undefined function mysql_pconnect()

Question

I have updated my codeigniter version from 2.2.4 step by step to 3.0.6 and I get an error:

An uncaught Exception was encountered  Type: Error  Message: Call to undefined function mysql_pconnect()  Filename: path-to-project\system\database\drivers\mysql\mysql_driver.php  Line Number: 135  Backtrace:  File: path-to-project\application\controllers\Main.php Line: 10 Function: __construct  File: path-to-project\index.php Line: 315 Function: require_once 

I have just replaced my index.php file and system directory with the new one and made some changes in my application according to tutorial.

and this is the Main controller:

class Main extends CI_Controller {      function __construct()     {         parent::__construct();         $this->load->model('main_model');     } } 

What causes the problem?!

And this is the link of the tutorial.

Answer 1

Deprecated features in PHP 5.5.x:

The original MySQL extension is now deprecated, and will generate E_DEPRECATED errors when connecting to a database. Instead, use the MySQLi or PDO_MySQL extensions.

You're using the deprecated 'mysql' dbdriver. Locate the config/database.php file and change dbdriver to use 'mysqli' :

$db['default']['dbdriver'] = 'mysqli';