Codeigniter: fatal error call to undefined function mysqli_init()
It is not a bug in your application, it is just a missing driver, so, you have couple of options...
Go to your php init and uncomment the following:
extension=php_mysqli.dllIf not, try installing it at your server, it varies depending on your distribution.
Try installing php5-mysqlnd
If you cannot do it by hosting restrictions then just move to mysql driver (wont need to change other configurations or queries in CodeIgniter or anything else...)
like this (at your config file)
$db['default']['dbdriver'] = 'mysql'; (you might have mysqli now)
I just had this issue on a ubuntu16.04, php7.1 install with Codeigniter 3.
Solution was simple (if hard to find!)
sudo apt-get install php7.0-mysqlI realised that the mysql*.ini files where missing from the etc/php/7.1/mods-available directory. Not sure how it happened, but that worked for me.
If you use 7.2, simply type sudo apt-get install php7.2-mysql
Use this:
sudo apt-get install php7.*-mysqlior
sudo phpenmod mysqlisudo service apache2 restart