Fatal error: Uncaught Error: Call to undefined function mysqli_connect() in /var/www/html/system/database/drivers/mysqli/mysqli_driver.php:77 Stack trace: #0 /var/www/html/system/database/drivers/mysqli/mysqli_driver.php(92): CI_DB_mysqli_driver->db_connect() #1 /var/www/html/system/database/DB_driver.php(116): CI_DB_mysqli_driver->db_pconnect() #2 /var/www/html/system/database/DB.php(149): CI_DB_driver->initialize() #3 /var/www/html/system/core/Loader.php(347): DB(Array, NULL) #4 /var/www/html/system/core/Loader.php(1172): CI_Loader->database() #5 /var/www/html/system/core/Loader.php(153): CI_Loader->_ci_autoloader() #6 /var/www/html/system/core/Controller.php(52): CI_Loader->initialize() #7 /var/www/html/system/core/CodeIgniter.php(309): CI_Controller->__construct() #8 /var/www/html/index.php(213): require_once('/var/www/html/s...') #9 {main} thrown in /var/www/html/system/database/drivers/mysqli/mysqli_driver.php on line 77