Codeigniter error: Call to undefined function mysql_pconnect() - php

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';

Answer 2

Thanks to Anant
I come to a conclusion:
I completely changed my old database.php file in config folder with the new one:
From:
$db['default']['hostname'] = 'localhost';
$db['default']['username'] = '';
$db['default']['password'] = '';
$db['default']['database'] = '';
$db['default']['dbdriver'] = '';
$db['default']['dbprefix'] = '';
$db['default']['pconnect'] = TRUE;
$db['default']['db_debug'] = TRUE;
$db['default']['cache_on'] = FALSE;
$db['default']['cachedir'] = '';
$db['default']['char_set'] = 'utf8';
$db['default']['dbcollat'] = 'utf8_general_ci';
$db['default']['swap_pre'] = '';
$db['default']['autoinit'] = TRUE;
$db['default']['stricton'] = FALSE;
To:
$db['default'] = array(
'dsn' => '',
'hostname' => '',
'username' => '',
'password' => '',
'database' => '',
'dbdriver' => 'mysqli',
'dbprefix' => '',
'pconnect' => FALSE,
'db_debug' => (ENVIRONMENT !== 'production'),
'cache_on' => FALSE,
'cachedir' => '',
'char_set' => 'utf8',
'dbcollat' => 'utf8_general_ci',
'swap_pre' => '',
'encrypt' => FALSE,
'compress' => FALSE,
'stricton' => FALSE,
'failover' => array(),
'save_queries' => TRUE
);
And the error is gone!

Answer 3

go to application/config/database.php
and just change mysql to mysqli
like
this was before:
$db['default']['dbdriver'] = 'mysql';
this was after solution:
$db['default']['dbdriver'] = 'mysqli';
i just change mysql to mysqli. that's it
my error was
Fatal error: Uncaught Error: Call to undefined function
mysql_pconnect() in
E:\manish_data\software\xampp\htdocs\ci2\system\database\drivers\mysql\mysql_driver.php:92
Stack trace: #0
E:\manish_data\software\xampp\htdocs\ci2\system\database\DB_driver.php(116):
CI_DB_mysql_driver->db_pconnect() #1
E:\manish_data\software\xampp\htdocs\ci2\system\database\DB.php(149):
CI_DB_driver->initialize() #2
E:\manish_data\software\xampp\htdocs\ci2\system\core\Loader.php(347):
DB(Array, NULL) #3
E:\manish_data\software\xampp\htdocs\ci2\application\models\usermodel.php(20):
CI_Loader->database() #4
E:\manish_data\software\xampp\htdocs\ci2\application\controllers\users.php(15): UserModel->getUsers() #5
E:\manish_data\software\xampp\htdocs\ci2\system\core\CodeIgniter.php(360):
Users->index() #6
E:\manish_data\software\xampp\htdocs\ci2\index.php(202):
require_once('E:\manish_data\...') #7 {main} thrown in
E:\manish_data\software\xampp\htdocs\ci2\system\database\drivers\mysql\mysql_driver.php
on line 92

Answer 4

If this error happened when you're hosting the website, make sure to set the correct PHP Version (the one your CI use).