These functions are only available under Windows 9.x, ME, NT4 and 2000. They have been added in PHP 4.0.4.
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/printer.
Windows users will enable php_printer.dll inside of php.ini in order to use these functions. In PHP 4 this DLL resides in the extensions/ directory within the PHP Windows binaries download. You may download this PECL extensions DLL from the PHP Downloads page or at http://snaps.php.net/.