How to print using receipt printer?

[eluser]TheFuzzy0ne[/eluser]
You didn't mention the steps you took to enable the DLL.

I take it you're running your server on Windows?
Have you installed the PECL extension?
Have you enabled php_printer.dll as an extension in your php.ini?
Have you tried putting php_printer.dll into the 'ext' directory of your PHP installation?
Have you verified that it's installed using phpinfo()?
Have you tried manually loading the DLL at runtime using dl()?