Memcached caching technology supports and optimizes PHP framework

Memcached caching technology supports and optimizes PHP framework

Memcached is a high-performance, distributed memory caching system that is widely used in large-scale Web applications. It can store data in memory faster than the traditional way of reading data from disk, so it can greatly improve the response speed of web applications. As a popular Web language, PHP also has many excellent frameworks, such as Laravel, Symfony, Yii, etc. These frameworks can use Memcached to improve performance and accelerate application response speed. This article will explore the application and optimization of Memcached from the perspective of the PHP framework to help PHP developers better use this caching technology.

1. Introduction to Memcached

Memcached is an open source software based on a distributed memory cache system, originally developed by Danga Interactive. Its ability to store data in memory and operate in a distributed manner enables high-performance data access, especially for applications that need to query databases. Developers can use its API to store, update and delete data, all of which can be done very quickly. In Memcached, data is divided into several blocks for storage. Each block is identified by a unique key value, and data access is based on these key values. Memcached can be used to cache high-frequency access data such as database query results, API response data, and Session data. It can effectively reduce the pressure on the database and server, thereby improving the performance and response speed of web applications.

2. Memcached support of PHP framework

As we all know, caching is one of the important means to improve the performance of web applications. Therefore, the PHP framework also provides related caching functions. Normally, the caching mechanism of the PHP framework is divided into two types: file cache and memory cache. The former saves cached data to files, while the latter uses memory caching technology such as Memcached. The following will take Laravel as an example to introduce the Memcached support of the PHP framework.

1. Larvel

Laravel is a popular PHP web framework and an excellent Memcached application. Laravel's caching mechanism supports a variety of cache drivers, including files, APC, Redis, Memcached, etc. Memcached is a very popular cache driver. To use Memcached cache in Laravel, you need to install the corresponding plug-in first. You can use the Composer command to install it:

composer require memcached/memcached

Subsequently, you need to configure the cache driver, which can be done in the Laravel configuration file Set in:

'cache' => [

'default' => env('CACHE_DRIVER', 'memcached'), 'stores' => [ 'memcached' => [ 'driver' => 'memcached', 'servers' => [ [ 'host' => '127.0.0.1', 'port' => 11211, 'weight' => 100, ], ], ], ],

],

In the above code, you can see that Laravel uses the default cache driver to be Memcached , and multiple Memcached servers can be configured. This way you can start using the caching mechanism.

2. Symfony

Symfony is another popular PHP web framework that also supports Memcached caching. To use Memcached cache in Symfony, you need to install the relevant components first:

composer require symfony/cache

Then make the following settings in the Symfony configuration file:

framework:

cache: app: cache.adapter.memcached default_memcached_provider: "%env(MEMCACHED_DSN)%"

In the above code, you can see that Symfony uses cache.adapter.memcached as the cache adapter. You can set %env(MEMCACHED_DSN)% to the address of the Memcached server, or use the hardcoded IP address and port directly.

3. Optimize Memcached

Although Memcached is already a very fast caching technology, we can still make some optimizations to further improve performance. Some common optimization methods will be introduced below.

1. Optimize data structure

The data stored by Memcached is a structure similar to a hash table, which maps each key to each data block, and each Data blocks have their own independent timestamp and size. When we save data, do not set the size of the data block too small, it is better to set it slightly larger, so as to avoid excessive chunking and fragmentation, thereby improving performance.

2. Turn off the CAS function

Memcached provides a CAS (Check And Set) mechanism to achieve concurrency control. However, in web applications, there is usually no need for such concurrency control, so the CAS function can be turned off to improve performance.

3. Optimize data transmission and serialization

In the transmission and serialization process of Memcached, optimization can be carried out according to specific situations. For example, data transfer time and size can be reduced through compression and binary data transfer. You can use the PHP igbinary extension to improve the performance of serialization.

4. Avoid using Memcached as data persistence storage

Memcached is a memory caching technology and is not suitable for data persistence storage. In some applications that require data persistence, In this scenario, other database systems such as MySQL, Redis, etc. should be used.

4. Summary

Through this article's discussion of the application and optimization methods of Memcached in the PHP framework, we learned that Memcached, as a high-performance, distributed memory cache system, has important application value in large-scale Web applications. We can use Memcached to improve the response speed of web applications, and can further improve performance by optimizing data structures, turning off CAS functions, optimizing data transmission and serialization, etc. In the specific process of using Memcached, we need to pay attention to some details and choose suitable PHP frameworks and plug-ins in order to maximize its value.

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