20) { $firstLine = substr($firstLine, 0, 19); } else { str_pad($firstLine, 20); } $msg = $firstLine; if(isset($_GET['secondLine'])) { $secondLine = $_GET['secondLine']; $len = strlen($secondLine); if($len > 20) { $secondLine = substr($secondLine, 0, 19); } $msg .= $secondLine; } $msg = preg_replace("/[^A-Za-z0-9?![:space:]]/","",$msg); // strip any ASCII commands (eg newlines because they will break the command and print a page) use this if accepting user input. $msg = substr($msg,0,40); // (optional) truncate message to 40 characters (2 lines) $printerIP = '127.0.0.1'; // IPV4 (a.b.c.d) obviously change to your printer IP $socket = socket_create(AF_INET,SOCK_STREAM,SOL_TCP); socket_connect($socket,$printerIP,9100) or die("Could not connect to printer."); $data = chr(27) . "%-12345X@PJL JOB" . chr(13) . chr(10) . "@PJL RDYMSG DISPLAY=\"$msg\"" . chr(13) . chr(10) . "@PJL EOJ" . chr(13) . chr(10) . chr(27) . "%-12345X"; socket_write($socket, $data) or die("Could not write to printer. Check connections."); echo "Printer status set to:
" . $firstLine . "
" . $secondLine . "
"; } ?> Set HP Printer LCD Status