This wrapper lets you interact with Clockwork without the hassle of having to create any XML or make HTTP calls.

Clockwork is Mediaburst's SMS API.

• A Clockwork account

Require the Clockwork library:

require 'class-Clockwork.php';

$clockwork = new Clockwork( $API_KEY ); //Be careful not to post your API Keys to public repositories.
$message = array( 'to' => '441234567891', 'message' => 'This is a test!' );
$result = $clockwork->send( $message );

We recommend you use batch sizes of 500 messages or fewer. By limiting the batch size it prevents any timeouts when sending.

$clockwork = new Clockwork( $API_KEY ); //Be careful not to post your API Keys to public repositories.
$messages = array( 
    array( 'to' => '441234567891', 'message' => 'This is a test!' ),
    array( 'to' => '441234567892', 'message' => 'This is a test 2!' )
);
$results = $clockwork->send( $messages );

The responses come back as arrays, these contain the unique Clockwork message ID, whether the message worked (success), and the original SMS so you can update your database.

Array
(
    [id] => VE_164732148
    [success] => 1
    [sms] => Array
        (
            [to] => 441234567891
            [message] => This is a test!
        )

)

If you send multiple SMS messages in a single send, you'll get back an array of results, one per SMS.

The result will look something like this:

Array
(
    [0] => Array
        (
            [id] => VI_143228951
            [success] => 1
            [sms] => Array
                (
                    [to] => 441234567891
                    [message] => This is a test!
                )

        )

    [1] => Array
        (
            [id] => VI_143228952
            [success] => 1
            [sms] => Array
                (
                    [to] => 441234567892
                    [message] => This is a test 2!
                )

        )

)

If a message fails, the reason for failure will be set in error_code and error_message.

For example, if you send to invalid phone number "abc":

Array
(
    [error_code] => 10
    [error_message] => Invalid 'To' Parameter
    [success] => 0
    [sms] => Array
        (
            [to] => abc
            [message] => This is a test!
        )

)

Check your available SMS balance:

$clockwork = new Clockwork( $API_KEY ); //Be careful not to post your API Keys to public repositories.
$clockwork->checkBalance();

This will return:

Array 
(
    [symbol] => £
    [balance] => 351.91
    [code] => GBP
    [account_type] => PAYG
)

Account Type can be either PAYG or Invoice.

The Clockwork wrapper will throw a ClockworkException if the entire call failed.

try 
{
    $clockwork = new Clockwork( 'invalid_key' );
    $message = array( 'to' => 'abc', 'message' => 'This is a test!' );
    $result = $clockwork->send( $message );
}
catch( ClockworkException $e )
{
    print $e->getMessage();
    // Invalid API Key
}

This class has a few additional features that some users may find useful, if these are not set your account defaults will be used.

See the Clockwork Documentation for full details on these options.

• $from [string]

  The from address displayed on a phone when they receive a message

• $long [boolean]

  Enable long SMS. A standard text can contain 160 characters, a long SMS supports up to 459.

• $truncate [nullable boolean]

  Truncate the message payload if it is too long, if this is set to false, the message will fail if it is too long.

• $invalid_char_action [string]

  What to do if the message contains an invalid character. Possible values are

  • error - Fail the message
  • remove - Remove the invalid characters then send
  • replace - Replace some common invalid characters such as replacing curved quotes with straight quotes

• $ssl [boolean, default: true]

  Use SSL when making an HTTP request to the Clockwork API

Options set on the API object will apply to all SMS messages unless specifically overridden.

In this example both messages will be sent from Clockwork:

$options = array( 'from' => 'Clockwork' );
$clockwork = new Clockwork( $API_KEY, $options ); //Be careful not to post your API Keys to public repositories.
$messages = array( 
    array( 'to' => '441234567891', 'message' => 'This is a test!' ),
    array( 'to' => '441234567892', 'message' => 'This is a test 2!' )
);
$results = $clockwork->send( $messages );

Set option values individually on each message.

In this example, one message will be from Clockwork and the other from 84433:

$clockwork = new Clockwork( $API_KEY, $options ); //Be careful not to post your API Keys to public repositories.
$messages = array( 
    array( 'to' => '441234567891', 'message' => 'This is a test!', 'from' => 'Clockwork' ),
    array( 'to' => '441234567892', 'message' => 'This is a test 2!', 'from' => '84433' )
);
$results = $clockwork->send( $messages );

Due to the huge variety of PHP setups out there a small proportion of users may get PHP errors when making API calls due to their SSL configuration.

The errors will generally look something like this:

Fatal error: 
Uncaught exception 'Exception' with message 'HTTP Error calling Clockwork API
HTTP Status: 0
cURL Erorr: SSL certificate problem, verify that the CA cert is OK. 
Details: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed'

If you're seeing this error there are two fixes available, the first is easy, simply disable SSL on Clockwork calls. Alternatively you can setup your PHP install with the correct root certificates.

$options = array( 'ssl' => false );
$clockwork = new Clockwork( $API_KEY, $options );  //Be careful not to post your API Keys to public repositories.

This is much more complicated as it depends on your setup, however there are many guides available online. Try a search term like "windows php curl root certificates" or "ubuntu update root certificates".

This project is licensed under the MIT open-source license.

A copy of this license can be found in license.txt.

If you have any feedback on this wrapper drop us an email to [email protected].

The project is hosted on GitHub at https://github.com/mediaburst/clockwork-php. If you would like to contribute a bug fix or improvement please fork the project and submit a pull request.