In php.ini there is the following extensions:

![](http://cdn1.netmake.com.br/img_kb/pt_br/extensoes_do_php/01.png)

If you would like to use one of those extension, for example MySQL, do the following:  
  
Remove the character ";" at the beginning of the extension  
  
Ex:  
  
extension = php\_mysql.dll  
  
Save the file and restart the web server.