Fatal error: Uncaught Error: Call to undefined function mysql_pconnect() in C:\wamp64\www\survey\system\database\drivers\mysql\mysql_driver.php:91 Stack trace: #0 C:\wamp64\www\survey\system\database\DB_driver.php(115): CI_DB_mysql_driver->db_pconnect() #1 C:\wamp64\www\survey\system\database\DB.php(148): CI_DB_driver->initialize() #2 C:\wamp64\www\survey\system\core\Loader.php(346): DB(Array, NULL) #3 C:\wamp64\www\survey\system\core\Loader.php(1171): CI_Loader->database() #4 C:\wamp64\www\survey\system\core\Loader.php(152): CI_Loader->_ci_autoloader() #5 C:\wamp64\www\survey\system\core\Controller.php(51): CI_Loader->initialize() #6 C:\wamp64\www\survey\application\controllers\survey.php(5): CI_Controller->__construct() #7 C:\wamp64\www\survey\system\core\CodeIgniter.php(308): survey->__construct() #8 C:\wamp64\www\survey\index.php(202): require_once('C:\\wamp64\\www\\s...') #9 {main} thrown in C:\wamp64\www\survey\system\database\drivers\mysql\mysql_driver.php on line 91