How to use Redis caching technology to optimize the running speed of PHP applications?

Redis caching technology has become a very popular solution in modern web applications. Its high-speed reading and writing capabilities, excellent data persistence capabilities and powerful data type support make Redis a modern application. An indispensable core component. The use of Redis caching technology in PHP applications is also very popular. This article will introduce how to use Redis caching technology to optimize the running speed of PHP applications.

1. Installing Redis

Before using Redis, we first need to install Redis on the server. You can install Redis through yum or download the tar package.

Step 1: Download Redis

wget http://download.redis.io/releases/redis-4.0.6.tar.gz

Step 2: Unzip Redis

tar xzf redis-4.0.6.tar.gz

Step 3: Install Redis

cd redis-4.0.6
make
make install

2. Configure PHP Redis client

We know that PHP cannot communicate directly with the Redis server, so you need to use the Redis client to communicate with the Redis server. Here we use PHP's official Redis extension, which can be installed directly using the pecl command.

Step 1: Install PHP Redis extension

pecl install redis

Step 2: Configure Redis extension in php.ini

extension=redis.so

3. Using Redis in PHP applications

Using Redis caching technology to optimize the running speed of PHP applications, we need to master three important concepts: caching, serialization , and keys.

Let’s talk about “caching” first. Caching refers to using the Redis server to store results or data in an application to reduce the burden on the server side, reduce database query operations and network overhead, thereby speeding up the response and execution speed of the application.

The cache is stored in the Redis database in the form of "key" (key) and "value" (value), so we need to set a unique key for each piece of cached data. For example:

$key = "user:123";

$user = array('name' => 'Alice', 'age' => 25, 'gender' = > 'F');

$redisObj->set($key, json_encode($user));

The above code shows how to store a user data in Redis. We first need to define a unique key, and then define the value of the user data. For convenience, here we use PHP's built-in json_encode() function to convert user data in array format into JSON format, and then store it in the Redis database so that subsequent PHP scripts can quickly read it. It should be noted here that the Redis client does not support arrays in PHP, so we need to convert them into strings or other data types that are supported by Redis for storage.

Next look at "serialization". Because Redis supports multiple data types, and PHP's variable types are relatively complex, when storing PHP variables, we need to serialize them first and then store them in the cache. Several serialization functions are provided in PHP, including serialize(), json_encode() and msgpack_pack(). The choice of which function to use depends on the type of data stored and the requirements for the data.

Finally, for different business needs, we can set different expiration times for the cache. For example:

$redisObj->set('user:123', json_encode($user), 3600);

Here we set the expiration time of this cached data to 3600 seconds , that is, the cache will automatically expire after 1 hour. This method can save a lot of database query overhead and network traffic for some data that is commonly used but has a long update cycle (such as user information, etc.). However, it should be noted that for data with high real-time requirements (such as order information, etc.), other mechanisms need to be used to ensure the accuracy and completeness of the data.

Conclusion

This article mainly introduces how to use Redis caching technology to optimize the running speed of PHP applications, mainly including the installation and configuration of Redis, and how to store and read cache in PHP applications. data, and setting cache expiration time. Redis has the advantages of fast reading and writing, efficient persistence and powerful data type support. It is an indispensable optimization solution in PHP applications.

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