A PHP Error was encountered

Severity: Notice

Message: Only variable references should be returned by reference

Filename: core/Common.php

Line Number: 272

Fatal error: Uncaught Error: Call to undefined function mysqli_init() in /var/www/html/system/codeigniter/database/drivers/mysqli/mysqli_driver.php:73 Stack trace: #0 /var/www/html/system/codeigniter/database/DB_driver.php(131): CI_DB_mysqli_driver->db_connect() #1 /var/www/html/system/codeigniter/database/DB.php(173): CI_DB_driver->initialize() #2 /var/www/html/system/cms/libraries/MX/Loader.php(96): DB(Array, NULL) #3 /var/www/html/system/codeigniter/core/Loader.php(1191): MX_Loader->database() #4 /var/www/html/system/codeigniter/core/Loader.php(163): CI_Loader->_ci_autoloader() #5 /var/www/html/system/cms/core/MY_Loader.php(79): CI_Loader->initialize() #6 /var/www/html/system/codeigniter/core/Controller.php(67): MY_Loader->initialize() #7 /var/www/html/system/cms/libraries/MX/Base.php(54): CI_Controller->__construct() #8 /var/www/html/system/cms/libraries/MX/Base.php(59): CI->__construct() #9 /var/www/html/system/cms/libraries/MX/Controller.php(4): require('/var/www/html/s...') #10 /var/www/html/system/cms/core/MY_Cont in /var/www/html/system/codeigniter/database/drivers/mysqli/mysqli_driver.php on line 73