PHP Database Access Using Redis

PHP Database Access

Using Redis

Problem

You want to use the Redis key-value store from your PHP program.

Solution

If you can install PECL extensions, install the redis extension and then use it as follows:

        $redis = new Redis();

        $redis->connect('127.0.0.1');

        $redis->set('counter', 0);

        $redis->incrBy('counter', 7);

        $counter = $redis->get('counter');

        print $counter;

If you can’t, use the Predis library:

        require 'Predis/Autoloader.php';

        Predis\Autoloader::register();

        $redis = new Predis\Client(array('host' => '127.0.0.1'));

        $redis->set('counter', 0);

        $redis->incrBy('counter', 7);

        $counter = $redis->get('counter');

        print $counter;

Discussion

Although the redis extension and Predis library differ in how they are installed and how you connect to a server, they behave similarly in many respects. Each gives you an object representing a connection to a Redis server (or a pool of Redis servers) and that object has methods corresponding to the different operations you can send to the server(s).

To install the redis extension, use the pecl command:

        pecl install redis

To install Predis, use pear:

        pear channel-discover pear.nrk.io

        pear install nrk/Predis

If you are using the Composer package manager, install Predis with a dependency string of "predis/predis".