predisHow do I use PHP to subscribe to Redis?

Using PHP to subscribe to Redis is easy.

First, you need to install the phpredis extension for PHP. This can be done with pecl install redis.

Then you can use the following code to subscribe to a Redis channel:

<?php
$redis = new Redis();
$redis->connect('127.0.0.1', 6379);
$redis->subscribe(array('channel1', 'channel2'), function($redis, $channel, $message) {
    echo "Channel $channel received $message\n";
});
?>

This will subscribe to the two channels channel1 and channel2. When a message is sent to either of these channels, the callback function will be called with the channel name and the message as parameters.

Code explanation

• $redis = new Redis();: Creates a new Redis instance.
• $redis->connect('127.0.0.1', 6379);: Connects to the Redis server.
• $redis->subscribe(array('channel1', 'channel2'), function($redis, $channel, $message) {...});: Subscribes to the channels channel1 and channel2.
• echo "Channel $channel received $message\n";: Prints the channel name and message when a message is received.

Helpful links

• phpredis
• Redis Pub/Sub

Edit this code on GitHub