[PHP-GTK] Access Computer devices with php-gtk

Hello is it possible to access computer devices with php-gtk? i want to
create a simple ePOS system to process orders on a Linux or Windows based
computer till system. it will be a standard computer with a cash draw, a
barcode reader, a Receipt Printer and a credit card machine.

can i possibly get data from the barcode and credit card machine then also
send a message to the cashdraw to open and printer to print a receipt on
sale complete with php-gtk. if i can't do it with pure php can i use another
language as a proxy between the device and php to pass the variables into
and out from the php-gtk application?

if i cant natively communicate with devices could i then use the 
http://php-java-bridge.sourceforge.net/doc/ php-java-brige  and create a
small java program to act as the proxy between the devices and php-gtk? 

your advice and input on this would be very grateful thank you.
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