This function may also return NULL on failure, instead of FALSE.
(PECL printer SVN)
printer_open — Opens a connection to a printer
This function tries to open a connection to the given printer.
printer_open() also starts a device context.
The printer name. If no parameter was given it tries to open a connection to the default printer (if not specified in php.ini as printer.default_printer, PHP tries to detect it).
Returns a printer handle on success or FALSE on failure.
Example #1 printer_open() example
$handle = printer_open("HP Deskjet 930c");
$handle = printer_open();