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https://www.phpclasses.org/blog/package/...ml#convert

How to Convert MySQL to MySQLi

The project above is a wrapper that allows you to use old php mysql code with the new cli driver

Find the download, its 4 small files, 

I changed the name of mysql2i.class.php to mysql2i.class_helper.php  and put it in \application\helpers\.

Loaded it \application\config\autoload.php
$autoload['helper'] = array('gj','mysql2i.class');

and it did a nice job of allowing me to use my old php mysql code  

\application\config\database.php
$db['default'] = array(
'dsn' => '',
'hostname' => 'localhost',
'username' => 'zCIDBclouda',
..
'dbdriver' => 'mysqli',