I am working on php_printer features since last week, I am using a KONICA MINOLTA C364SeriesPCL Printer installed on local server
PHP is server side. Printing is handled client side. You need to configure your printer to print on both sides. Go into your printer and set it up to be duplex. How this is done will be dependent on the OS and printer driver.
FYI: I recall working with PHP, PDF, and printers when I needed to print custom size labels. Just in case you end up needing to add support for custom page sizes go to on Windows 7: Control Panel\\Hardware and Sound\\Devices and Printers > click printer > Print server properties add appropriate form eg 6x6.
I hope that helps.
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