<?php
function send($from, $to, $message)
{
    $transport = new SocketTransport(array('192.168.100.43'),2775);
    $transport->setRecvTimeout(10000);
    $transport->setSendTimeout(10000);
    $smpp = new SmppClient($transport);
    $transport->open();
    $smpp->bindTransmitter("smppclient1","password");

    SmppClient::$sms_null_terminate_octetstrings = false;
    SmppClient::$csms_method = SmppClient::CSMS_PAYLOAD;
    SmppClient::$sms_registered_delivery_flag = SMPP::REG_DELIVERY_SMSC_BOTH;

    $encodedMessage = GsmEncoder::utf8_to_gsm0338($message);
    $from = new SmppAddress($from,SMPP::TON_ALPHANUMERIC);
    $to = new SmppAddress($to,SMPP::TON_INTERNATIONAL,SMPP::NPI_E164);

    $smpp->sendSMS($from,$to,$encodedMessage);
    $smpp->close();
}