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Informations about the package pawl
Pawl
An asynchronous WebSocket client in PHP
Install via composer:
composer require ratchet/pawlUsage
Pawl as a standalone app: Connect to an echo server, send a message, display output, close connection:
Classes
There are 3 primary classes to be aware of and use in Pawl:
Connector:
Makes HTTP requests to servers returning a promise that, if successful, will resolve to a WebSocket object. A connector is configured via its constructor and a request is made by invoking the class. Multiple connections can be established through a single connector. The invoke mehtod has 3 parameters:
- $url: String; A valid uri string (starting with ws:// or wss://) to connect to (also accepts PSR-7 Uri object)
- $subProtocols: Array; An optional indexed array of WebSocket sub-protocols to negotiate to the server with. The connection will fail if the client and server can not agree on one if any are provided
- $headers: Array; An optional associative array of additional headers requests to use when initiating the handshake. A common header to set is
Origin
WebSocket:
This is the object used to interact with a WebSocket server. It has two methods: send and close.
It has two public properties: request and response which are PSR-7 objects representing the client and server side HTTP handshake headers used to establish the WebSocket connection.
Message:
This is the object received from a WebSocket server. It has a __toString method which is how most times you will want to access the data received.
If you need to do binary messaging you will most likely need to use methods on the object.
Example
A more in-depth example using explicit interfaces: Requesting sub-protocols, and sending custom headers while using a specific React Event Loop:
All versions of pawl with dependencies
evenement/evenement Version ^3.0 || ^2.0
guzzlehttp/psr7 Version ^2.0 || ^1.7
ufee/rfc6455 Version ^0.3
react/socket Version ^1