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Thank you for your question.

Sending SMS via Till an be achieved different ways depending on your PHP version and the extensions available in your environment.

If you are using >= PHP 5.5 you can leverage the latest version of GuzzleHTTP (https://github.com/guzzle/guzzle).

Here's an example of sending a text message via Till using GuzzleHTTP:

<?php
// # Example Dependencies
// - PHP >= 5.5.36
// - PHP cURL extension
//   * sudo apt-get install php-curl
// - Composer
//   * curl -sS https://getcomposer.org/installer | php
//
// # Install Guzzle HTTP Client
// - php composer.phar require guzzlehttp/guzzle

// Init Composer
require "vendor/autoload.php";

// Load Guzzle HTTP Client
use Guzzle\Http\Client;

// Your Till credentials
$till_username = "username";
$till_api_key = "api_key";

// The Till project body
$till_project = [
    "phone" => ["phone_number"],
    "text" => "Hello Till!"
];

// Execute HTTP request
$client = new GuzzleHttp\Client();
try {

    $res = $client->request(
        "POST", 
        "https://platform.tillmobile.com/api/send?username=".$till_username."&api_key=".$till_api_key,
        ["body" => json_encode($till_project)]
    );

    // Till HTTP response body
    echo $res->getBody();

} catch(Exception $e) {

    echo $e;

}
?>

If you are on an older version of PHP it may be necessary to use an older version of GuzzleHTTP or possible use the cURL extension directly:
http://php.net/manual/en/curl.examples.php

Note: The json_encode function was introduced in PHP 5.2. If you are using PHP 5.1 you would also need to implement or include a JSON serialization library.