This » PECL extension is not bundled with PHP. Information for installing this PECL extension may be found in the manual chapter titled Installation of PECL extensions. Additional information such as new releases, downloads, source files, maintainer information, and a CHANGELOG, can be located here: » http://pecl.php.net/package/fribidi.
Para poder usar estas funções você deve compilar o PHP com suporte Fribidi usando a opção de configuração --with-fribidi[=DIR] .
usuários do Windows irão ativar php_fribidi.dll dentro do php.ini para poder usar estas funções. A DLL for this PECL extension is currently unavailable. See also the building on Windows section.