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Informations about the package pusher-php-server

Pusher Channels HTTP PHP Library

Build Status

PHP library for interacting with the Pusher Channels HTTP API.

Register at and use the application credentials within your app as shown below.


You can get the Pusher Channels PHP library via a composer package called pusher-php-server. See

Or add to composer.json:

and then run composer update.

Or you can clone or download the library files.

We recommend you use composer.

This library depends on PHP modules for cURL and JSON. See cURL module installation instructions and JSON module installation instructions.

Supported platforms

Pusher Channels constructor

Use the credentials from your Pusher Channels application to create a new Pusher\Pusher instance.

The fourth parameter is an $options array. The additional options are:

For example, by default calls will be made over a non-TLS connection. To change this to make calls over HTTPS use:

For example, if you want to set custom curl options, use this:

Note: The host option overrides the cluster option!

Note: The $options parameter was introduced in version 2.2.0 of the library. Previously additional parameters could be passed for each option, but this was becoming unwieldy. However, backwards compatibility has been maintained.

Logging configuration

It is strongly recommended that you configure a logger. By default errors are easy to miss because the library will only return false if anything fails.

PSR-3 Support

The recommended approach of logging is to use a PSR-3 compliant logger implementing Psr\Log\LoggerInterface. The Pusher object implements Psr\Log\LoggerAwareInterface, meaning you call setLogger(LoggerInterface $logger) to set the logger instance.

Custom Logger (deprecated)

Warning: Using Pusher::set_logger() and a custom object implementing log() is now deprecated and will be removed in the future. Please use a PSR-3 compliant logger.

You set up logging by passing an object with a log function to the pusher->set_logger function:

If you use the above example in code executed from the console/terminal the debug information will be output there. If you use this within a web app then the output will appear within the generated app output e.g. HTML.

Publishing/Triggering events

To trigger an event on one or more channels use the trigger function.

A single channel

Multiple channels


It's also possible to send multiple events with a single API call (max 10 events per call on multi-tenant clusters):


Objects are automatically converted to JSON format:

The output of this will be:

Socket id

In order to avoid duplicates you can optionally specify the sender's socket id while triggering an event (

JSON format

If your data is already encoded in JSON format, you can avoid a second encoding step by setting the sixth argument true, like so:

Authenticating Private channels

To authorise your users to access private channels on Pusher, you can use the socket_auth function:

Authenticating Presence channels

Using presence channels is similar to private channels, but you can specify extra data to identify that particular user:


This library provides a way of verifying that webhooks you receive from Pusher are actually genuine webhooks from Pusher. It also provides a structure for storing them. A helper method called webhook enables this. Pass in the headers and body of the request, and it'll return a Webhook object with your verified events. If the library was unable to validate the signature, an exception is thrown instead.

End to end encryption (beta)

This library supports end to end encryption of your private channels. This means that only you and your connected clients will be able to read your messages. Pusher cannot decrypt them. You can enable this feature by following these steps:

  1. You should first set up Private channels. This involves creating an authentication endpoint on your server.

  2. Next, generate your 32 byte master encryption key, base64 encode it and store it securely. This is secret and you should never share this with anyone. Not even Pusher.

    To generate an appropriate key from a good random source, you can use the openssl command:

  3. Specify your master encryption key when creating your Pusher client:

  4. Channels where you wish to use end to end encryption should be prefixed with private-encrypted-.

  5. Subscribe to these channels in your client, and you're done! You can verify it is working by checking out the debug console on the and seeing the scrambled ciphertext.

Important note: This will not encrypt messages on channels that are not prefixed by private-encrypted-.

Limitation: you cannot trigger a single event on multiple channels in a call to trigger, e.g.

Rationale: the methods in this library map directly to individual Channels HTTP API requests. If we allowed triggering a single event on multiple channels (some encrypted, some unencrypted), then it would require two API requests: one where the event is encrypted to the encrypted channels, and one where the event is unencrypted for unencrypted channels.

Presence example

First set this variable in your JS app:

Next, create the following in presence_auth.php:

Note: this assumes that you store your users in a table called users and that those users have a name column. It also assumes that you have a login mechanism that stores the user_id of the logged in user in the session.

Application State Queries

Get information about a channel

It's also possible to get information about a channel from the Channels HTTP API.

For presence channels you can also query the number of distinct users currently subscribed to this channel (a single user may be subscribed many times, but will only count as one):

If you have enabled the ability to query the subscription_count (the number of connections currently subscribed to this channel) then you can query this value as follows:

Get a list of application channels

It's also possible to get a list of channels for an application from the Channels HTTP API.

Get a filtered list of application channels

It's also possible to get a list of channels based on their name prefix. To do this you need to supply an $options parameter to the call. In the following example the call will return a list of all channels with a presence- prefix. This is idea for fetching a list of all presence channels.

This can also be achieved using the generic pusher->get function:

Get a list of application channels with subscription counts

The HTTP API returning the channel list does not support returning the subscription count along with each channel. Instead, you can fetch this data by iterating over each channel and making another request. But be warned: this approach consumes (number of channels + 1) messages!

Get user information from a presence channel

This can also be achieved using the generic pusher->get function:

The $response is in the format:

Generic get function

Used to make GET queries against the Channels HTTP API. Handles authentication.

Response is an associative array with a result index. The contents of this index is dependent on the HTTP method that was called. However, a status property to allow the HTTP status code is always present and a result property will be set if the status code indicates a successful call to the API.

Running the tests

Requires phpunit.


Copyright 2014, Pusher. Licensed under the MIT license:

Copyright 2010, Squeeks. Licensed under the MIT license:

Requires php Version ^7.1|^8.0
ext-curl Version *
psr/log Version ^1.0
paragonie/sodium_compat Version ^1.6

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