mysqli compatible with myslql?

[trix@]

We have a large number of web sites hosted on our Plesk server. Currently the php_mysqli.dll etension is not enabled in php.ini. I want to allow websites on our server to use mysql or mysqli whichever they prefer. Is this possible? If I enable the mysqli extension will all the websites have to modify their code to work with mysqli.

Thanks for your help.

 

[sergius]

http://forums.mysql.com/read.php?11,29823,44201