I run Ubuntu desktop 14.04 LTS (Trusty Tahr), and I am trying to setup Apache 2, MySQL server and PHP, but I keep gettin the following error:
PHP Fatal error: Call to undefined function mysqli_connect() in..
What I have done is these changes in the correct php.ini:
uncomment:
extension=msqli.so
set path aquired from phpinfo():
extension_dir = "./usr/lib/php5/20121212+lfs"
Why is the mysqli function to connect to the database still undefined?
In my case php5-mysql was missing from my Ubuntu server. After installing the package it is working fine with mysqli adapter.
sudo apt-get install php5-mysql
It resolved my CodeIgniter 3.0 mysqli connection valid.
running updates is usually recommended
sudo apt-get update
then install needed version
sudo apt-get install php5-mysql
sudo apt-get install php7.0-mysql
sudo apt-get install php7.1-mysql
sudo apt-get install php7.2-mysql
restart apache
sudo service apache2 restart