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.
Windows users must enable php_printer.dll inside of php.ini in order to use these functions. You may obtain this unbundled PECL extension from the various PECL snaps pages (select the appropriate repository for your version of PHP): PECL for PHP 4.3.x, PECL for PHP 5.0.x or PECL Unstable.