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/crack.
In PHP 4 this PECL extensions source can be found in the ext/ directory within the PHP source or at the PECL link above. Para poder usar estas funções você deverá compilar o PHP com suporte a Crack usando a opção de configuração --with-crack[=DIR] .
Usuários do windows devem abilitar php_crack.dll dentro do php.ini para poder usar estas funções. In PHP 4 this DLL resides in the extensions/ directory within the PHP Windows binaries download. A DLL for this PECL extension is currently unavailable. See also the building on Windows section.