phpserial.php

<?php

require __DIR__ . '/vendor/autoload.php';

$serial = new PhpSerial();

$serial->deviceSet("/dev/ttyUSB0");
$serial->confBaudRate(19200);
$serial->confParity("none");
$serial->confCharacterLength(8);
$serial->confStopBits(1);
$serial->confFlowControl("none");
$serial->deviceOpen();
echo "Initializing device...";
sleep(10);

echo "Now sending message...";
$serial->sendMessage("PHP and Arduino\n");
sleep(2);

$serial->deviceClose();