Silverstripe-sms is a project mainly written in PHP, it's free.
An SMS module for Silverstripe
silverstripe-sms is a Silverstripe module that has support for sending SMS (Short Message Service).
$to = 61410123456;
$from = 61410123456; // Your number or can also be text if supported by provider (ie. 'John Smith')
$message = 'Here is the message.';
SMS::send($to, $message, $from);The module has been built using a quasi factory pattern so that in the future more providers can be added.
SMS::configure('Burst', array('apiKey' => 'YOUR-BURST-API-KEY', 'apiSecret' => 'YOUR-BURST-API-SECRET'));