Using clear cache technology in ThinkPHP6

With the continuous development of Internet applications, the number of website visits is also increasing. In order to speed up website access, websites often use caching technology. Caching can avoid repeated calculations and save server resources, but it can also cause some problems, such as cache expiration or data in the cache being out of sync. In order to solve these problems, ThinkPHP6 provides a very convenient cache management mechanism, which can easily clear the cache and ensure the normal operation of the website. Next, we will introduce the use of clear cache technology in ThinkPHP6.

1. Types of cache

In ThinkPHP6, cache is mainly divided into four categories:

1. File cache: cache data in files, suitable for the cache amount Small scene;
2. Redis cache: Use Redis as the cache server, suitable for high concurrency and large data volume scenarios;
3. Memcache cache: Use Memcache as the cache server, suitable for high concurrency and big data Amount of scenarios;
4. Database caching: Store cached data in the database, suitable for cached data that needs to be stored permanently.

2. How to clear the cache

Clearing the cache is mainly to update the data in the cache in a timely manner so that the website can display the latest content. In ThinkPHP6, we can clear the cache in the following ways:

1. Used in the controller

You can call Cache::clear(( ) method to clear the cache. This method can clear all caches, or only the specified cache. You need to pass in the cache name when using it. The sample code is as follows:

use thinkacadeCache;

// 清除指定缓存
Cache::delete('cache_name');

// 清除所有缓存
Cache::clear();

2. Use from the command line

ThinkPHP6 also provides a command line tool to clear the cache. Use the command php think cache:clear to clear all types of cache, use php think cache:clear –type=file to clear the file cache, use php think cache:clear –type=redis can clear the Redis cache, and other types of cache clearing methods are similar.

3. Clear the cache regularly

In order to prevent the cache from occupying too many server resources, it is recommended to clear the cache regularly outside of the peak period of the website. In ThinkPHP6, we can implement scheduled cache clearing through Crontab scheduled tasks. Scheduled tasks need to be added to the system to regularly clear expired cached data. The sample code is as follows:

First, create a scheduled task script and save it in the application/command directory. The script content is as follows:

<?php

namespace appcommand;

use thinkconsoleCommand;
use thinkconsoleInput;
use thinkconsoleOutput;
use thinkacadeCache;

class ClearCache extends Command
{
    protected function configure()
    {
        // 设置脚本信息
        $this->setName('clear-cache')->setDescription('Clear all cache');
    }

    protected function execute(Input $input, Output $output)
    {
        // 执行清除缓存操作
        Cache::clear();
    }
}

Then, add the scheduled task in config/crontab.php, The code is as follows:

return [
    // 定时清除缓存
    '0 0 * * *' => '\app\command\ClearCache',
];

The above code means that the ClearCache script is executed at 0:00 every day to clear the cache.

3. Summary

Caching is an important means to optimize website access speed, but it may also cause some problems. In ThinkPHP6, we can use a variety of methods to clear the cache to ensure the normal operation of the website. At the same time, it is recommended to clear the cache regularly outside of website peak periods to avoid cache expiration or cached data being out of sync.

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