bambslaundry-new/websocket_print/vendor/mike42/escpos-php/example/interface/linux-usb.php

<?php
/* Change to the correct path if you copy this example! */
require __DIR__ . '/../../autoload.php';
use Mike42\Escpos\Printer;
use Mike42\Escpos\PrintConnectors\FilePrintConnector;

/**
 * On Linux, use the usblp module to make your printer available as a device
 * file. This is generally the default behaviour if you don't install any
 * vendor drivers.
 *
 * Once this is done, use a FilePrintConnector to open the device.
 *
 * Troubleshooting: On Debian, you must be in the lp group to access this file.
 * dmesg to see what happens when you plug in your printer to make sure no
 * other drivers are unloading the module.
 */
try {
    // Enter the device file for your USB printer here
    $connector = new FilePrintConnector("/dev/usb/lp0");
    //$connector = new FilePrintConnector("/dev/usb/lp1");
    //$connector = new FilePrintConnector("/dev/usb/lp2");

    /* Print a "Hello world" receipt" */
    $printer = new Printer($connector);
    $printer -> text("Hello World!\n");
    $printer -> cut();

    /* Close printer */
    $printer -> close();
} catch (Exception $e) {
    echo "Couldn't print to this printer: " . $e -> getMessage() . "\n";
}