Codeigniter: fatal error call to undefined function mysqli_init()

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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.dll

If 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)

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