PHP API & SDK Docs 9.0.3

This guide walks you through a simple "Hello, World" application that demonstrates the core concepts of PubNub:

• Setting up a connection
• Sending messages
• Receiving messages in real-time

Overview​

This guide will help you get up and running with PubNub in your PHP application. We'll create a simple application that demonstrates how to connect to PubNub, subscribe to channels, and publish messages.

The code examples will work in both web environments and command-line scripts, with notes indicating any environment-specific considerations when relevant.

Prerequisites​

Before we dive in, make sure you have:

• A basic understanding of PHP (v7.0 or newer recommended)
• PHP installed on your system (either on a web server or as CLI)
• Composer (recommended) or the ability to manually manage dependencies
• A PubNub account (we'll help you set this up!)

Setup​

Get your PubNub keys​

First, get your PubNub keys:

• Sign in or create an account on the PubNub Admin Portal.
• Create an app (or use an existing one).
• Find your publish and subscribe keys in the app dashboard.

When you create an app, PubNub automatically generates a keyset. You can use the same keyset for development and production, but we recommend separate keysets for each environment to improve security and management.

Install the SDK​

Install the PHP SDK using Composer.

1. For a fresh project (no existing code), run the following command in the project directory.

   1composer init
   

2. Then, run this command (for both the existing Composer projects and the newly initiated ones).

   1composer require pubnub/pubnub‌
   

Steps​

Initialize PubNub​

Create a PHP file to initialize the PubNub client: