Summarize the common methods of Redis in PHP

Redis is a high-performance key-value database. It provides many efficient data structures and interfaces for developers to use, and has become one of the preferred caching solutions for many web applications. As a widely used web development language, PHP is naturally no exception. Using Redis in PHP can greatly improve the performance and stability of web applications.

The following are common methods of Redis in PHP:

1. Connect to Redis

To connect to the Redis database, you can use the connet method of the Redis class to instantiate the Redis object, as shown below :

$redis = new Redis();
$redis->connect('127.0.0.1', 6379);

Among them, 127.0.0.1 is the address of the Redis server, and 6379 is the port number of the Redis server.

2. Set up cache

Redis provides a variety of data structures that can be stored in memory as cache. Among them, the most commonly used ones are string and hash. For example, the following code stores a string in the Redis cache:

$redis->set('mykey', 'myvalue');

Stores a hash in Redis:

$redis->hSet('myhash', 'mykey1', 'myvalue1');

3. Get the cache

from You can use the get method and hGet method to obtain the cache in Redis. For example, get a string cache:

$myvalue = $redis->get('mykey');

Get a hash cache:

$myvalue1 = $redis->hGet('myhash', 'mykey1');

4. Delete the cache

To delete the cache from Redis, you can use the delete method or the unset method . For example, delete a string cache:

$redis->delete('mykey');

Delete a hash cache:

$redis->hDel('myhash', 'mykey1');

5. Set expiration time

Redis supports setting the expiration time, and the cache will automatically delete. You can use expire method or pexpire method. For example, set the expiration time of a string cache:

$redis->expire('mykey', 60);

Set the expiration time of a hash cache to 1 hour:

$redis->pexpire('myhash', 3600000);

6. Increase the counter

Redis can It is very convenient to implement the counter function using the incr and incrBy methods. For example, increase a counter by 1:

$redis->incr('mycounter');

Increase a counter by 10:

$redis->incrBy('mycounter', 10);

7. Publish and subscribe

Redis also provides publish and subscribe functions, which can be used Used in scenarios such as message push and real-time communication. You can use the publish method to publish messages and the subscribe method to subscribe to messages. For example, publish a message:

$redis->publish('mychannel', 'hello world');

Subscribe to a message:

$redis->subscribe(array('mychannel'), 'callback');

The above are the common methods of Redis in PHP. With the foundation of these methods, we can implement various efficient caching and application scenarios.

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