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Slack API and WebHook integration in PHP



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v0.7.0 2016-05-02 17:45 UTC


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Phlack eases the creation of Slack Integrations in PHP.


via composer:

composer require mcrumm/phlack

Basic Usage

Send a Message

$phlack = new Crummy\Phlack\Phlack('https://my.webhook.url');

$response = $phlack->send('Hello, from Phlack!');

if (200 === $response['status']) {
    echo 'Success!';

Advanced Usage

Legacy WebHook URLs

Early versions of Incoming Webhooks used a generic webhook path for all teams. If your webhook URL starts with something like, give Phlack your team name and Incoming Webhook token, and it will do the rest:

$phlack  = new Crummy\Phlack\Phlack([
    'username' => 'myteam',
    'token'    => 'my_webhook_token'

Factory Method

If you prefer, you can instantiate Phlack via its static factory() method:

$phlack = Crummy\Phlack\Phlack::factory($config);

New Instance

Besides a webhook url or an array configuration, Phlack will also accept a PhlackClient instance as a constructor argument:

$client = new Crummy\Phlack\Bridge\Guzzle\PhlackClient('https://my.webhook.url');
$phlack = new Crummy\Phlack\Phlack($client);

Note: The constructor and factory method both accept the same types of arguments: a string representing the webhook url, an array of client config options, or a PhlackClient object.

❤️ for Guzzle

The PhlackClient is simply a web service client implemented with Guzzle. Examine its service description for more details.


Messages represent the payload for Slack's Incoming WebHook integration.

Creating Messages

Messages can be created using the provided builders, or they can be instantiated directly.

Message Builder

The MessageBuilder allows for programmatic creation of a Message object.

// ...
$messageBuilder = $phlack->getMessageBuilder();
  ->setText('I was created in the MessageBuilder')
$message = $messageBuilder->create();

You can also use the MessageBuilder directly to create the Message object and add Attachments. The MessageBuilder supports method chaining to allow for adding multiple Attachment objects to a single message.

$messageBuilder = $phlack->getMessageBuilder(); // Get the MessageBuilder

    ->setText('This message contains multiple attachments.') // Message text.
    ->createAttachment()  // Returns the AttachmentBuilder.
        ->setFallback($title . ' ' . $pretext)
    ->end() // Creates the first attachment and returns the MessageBuilder
    ->setUsername($username) // Sets username on the Message object.
    ->createAttachment() // Returns the AttachmentBuilder.
        ->setTitle('Attachment #2')
        ->setFallback('Attachment #2 for example purposes')
        ->setText('Add multiple attachments to a Phlack Message via method chaining.')
    ->end() // Creates the second attachment and returns the MessageBuilder.

$message = $messageBuilder->create();

Note: When adding Attachments this way, you must call end() once for each attachment so that the MessageBuilder knows to create the Attachment object and return itself for further modification.

Attachment Builder

If you prefer, you may use the AttachmentBuilder in a standalone fashion:

// ...

// Get the AttachmentBuilder
$attachmentBuilder = $phlack->getAttachmentBuilder();

// Create the Attachment
$attachment =
        ->setTitle('My Attachment Title')
        ->setPretext('Some optional pretext')
        ->setText('This is the body of my attachment')
        ->addField('Field 1', 'Some Value', true)
        ->setFallback($title . ' ' . $pretext)

// Create a Message to contain the Attachment
$message = new \Crummy\Phlack\Message\Message('This message contains an attachment.');

// Add the Attachment to the Message

Message Object

A Message can be instantiated with just a text value:

use Crummy\Phlack\Message\Message;
$message = new Message('Hello, from phlack!');
echo 'The message payload: ' . PHP_EOL:
echo $message; // Output: {"text": "Hello, from phlack!"}

But you can set optional parameters when constructing the message, too:

use Crummy\Phlack\Message\Message;
$message = new Message('Hello, from phlack!', '#random');
echo 'The message payload: ' . PHP_EOL:
echo $message; // Output: {"text": "Hello, from phlack!", "channel": "#random"}

Sending Messages

Use Phlack's send() command to fire off the message:

// ...
$response = $phlack->send($message);

if (200 != $response['status']) {
  die('FAIL! - ' . $response['text']);

echo 'The message was sent: ' . $message;

Custom Messages

Custom messages can be sent by using an array of valid parameters:

    'channel'      => '#random',
    'icon_emoji'   => ':taco:',
    'username'     => 'Phlack',
    'unfurl_links' => true,
    'text'         => 'I :heart: the <|Slack API>!',

Note: No input validation is performed on custom message parameters. You are responsible for formatting channels, emojis, and text data yourself.

Message Response

The MessageResponse hash contains the status, reason, and text from the response.

Responses from the Incoming Webhooks Integration are very sparse. Success messages will simply return a status of 200. Error messages will contain more details in the response text and reason.

More Examples

See the examples directory for more use cases.

Slack API

Programmatic access to the Slack API is provided via the ApiClient.

Note: Currently, bearer token authentication is the only supported authentication method. Contributions toward OAuth2 support would be greatly appreciated.

Getting a Client

Get an ApiClient object by instantiating it with a hash containing your API token, or passing a config hash to its factory method.

via factory():


use Crummy\Phlack\Bridge\Guzzle\ApiClient;

$slack = ApiClient::factory([ 'token' => 'my_bearer_token' ]);

via new ApiClient():


use Crummy\Phlack\Bridge\Guzzle\ApiClient;

$slack = new ApiClient([ 'token' => 'my_bearer_token' ]);

API Methods

The methods currently implemented are:

Consult the client's service description for information on the responses returned by the API methods.

Example: Listing all Channels


use Crummy\Phlack\Bridge\Guzzle\ApiClient;

$config = [ 'token' => 'my_bearer_token' ];
$slack = new ApiClient($config);

echo 'Fetching Channels List...' . PHP_EOL;
$result = $slack->ListChannels();

if (!$result['ok']) {
    die('FAIL! Error was: ' . $result['error'] . PHP_EOL);

foreach ($result['channels'] as $channel) {
    printf('%s: %s' . PHP_EOL, $channel['name'], $channel['purpose']['value']);

Resource Iterators

Example: ListFilesIterator

The ListFilesIterator eases the ability to iterate through multiple pages of data from the Slack API. Using the iterator eliminates the need to manually call the API multiple times to retrieve all pages of the result set.

$iterator = $slack->getIterator('ListFiles');

$i = 0;
foreach ($iterator as $file) {
    echo $file['title'] . PHP_EOL;

echo PHP_EOL . 'Retrieved ' . $i . ' files.' . PHP_EOL;

A complete example is available in the examples directory.

Note: The ListFilesIterator is not strictly necessary to page through file results, but it's certainly easier than the alternative. An example without the iterator is also available.

More API Examples

See the API examples directory for more use cases.


Any undocumented portion of this library should be considered EXPERIMENTAL AT BEST. Proceed with caution, and, as always, pull requests are welcome.


The regex in the LinkFormatter was pulled directly from StevenSloan and his slack-notifier project.


Please see the CONTRIBUTING file for details.


Phlack is released under the MIT License. See the bundled LICENSE file for details.