PHP implementation of sms.sluzba.cz API.
composer matejbukovsky/axima-sms-gate
use Axima\SmsGate\Client;
use GuzzleHttp\Client as GuzzleClient;
use Axima\SmsGate\Message;
$client = new Client(new GuzzleClient, 'login', 'password'); // create sender
$message = new Message('Hello world!', ['123465789', '987654321']); // create message
$message->addPhone('123465798');// possibly add another number
$message->setSendAt(new \DateTimeImmutable('+ 2 minutes')); // send after 2 minutes
$count = $this->client->sendSms($message); // returns number of sent messages