I\'m using XAMPP for Windows and decided to try out Symfony 2.
XAMPP for Windows
Symfony 2
As soon as I get to Symfony Configuration page it recommends me to
Symfony Configuration
To activate this extension in Xampp, just edit your php.ini (i.e. in C:\xampp\php directory) and remove the semicolon to uncomment this line :
;extension=php_intl.dll
Eventually don’t forget to restart Apache !