This PECL extension
is not bundled with PHP.
  Additional information such as new releases,
downloads, source files, maintainer information, and a CHANGELOG, can be
located here: 
  http://pecl.php.net/package/fribidi.
 
  In order to use these functions you must compile PHP with Fribidi support
  by using the --with-fribidi[=DIR] 
  configure option.
 
  Windows users will enable php_fribidi.dll inside
  of php.ini in order to use these functions.
  You may download this PECL
extension DLL from the 
PHP Downloads page or at 
http://snaps.php.net/.