How to delete cache in thinkphp

When using thinkphp for development, using cache can improve website performance, reduce the number of database queries, and improve website response speed. However, if the cache expiration time is set improperly or the cache data changes, cache deletion is required. This article will explain how to delete cache in thinkphp.

1. Cache expiration time setting

When using thinkphp for caching operations, you need to specify the cache expiration time. It can be set in the cache.php file in the config directory. The code is as follows:

return [
    // 默认设置的缓存
    'default' => env('cache.driver', 'file'),

    // 缓存连接参数
    'stores' => [
        // 文件缓存
        'file' => [
            'driver' => 'file',
            'path'   => env('cache.path', app()->getRuntimePath() . 'cache'),
        ],

        // Redis缓存
        'redis' => [
            'driver' => 'redis',
            'host'   => env('cache.redis.host', '127.0.0.1'),
            'port'   => env('cache.redis.port', 6379),
            'password' => env('cache.redis.password', ''),
            'select' => env('cache.redis.select', 0),
            'timeout' => env('cache.timeout', 0),
            'expire' => env('cache.expire', 0),
            'persistent' => env('cache.redis.persistent', false),
            'prefix' => '',
            'serialize' => [],
        ],
    ],

    // 缓存配置
    'cache' => [
        // 驱动方式
        'type'  => 'File',
        // 缓存保存目录
        'path'  => '../runtime/cache/',
        // 缓存前缀
        'prefix'=> '',
        // 缓存有效期 0表示永久缓存
        'expire'=> 0,
    ],
];

In the above code, the configuration items in the cache.php file are very obvious. The meaning of each configuration item is as follows:

• default: The default cache type can be file, redis, etc. according to the value of cache.driver in the specified environment variable.
• stores: Supports multiple types of cache, file cache and Redis cache.
• driver: Specify the cache type, such as file, redis, etc.
• cache: Configure cache properties.

In specific business code, use the Cache class for caching operations. For example, when setting the cache, you can use the following code:

use think\facade\Cache;

// 设置缓存
Cache::set('key', 'value', 3600);

In the above code, the first parameter of the set method is key, the second parameter is value, and the third parameter is the cache expiration time, unit It's seconds. After setting up the cache, you can use the get method to obtain the cache data. For example:

use think\facade\Cache;

// 获取缓存
$value = Cache::get('key');

2. Cache deletion

When cache data expires or changes, cache deletion is required. thinkphp provides the delete method to delete the cache. For example:

use think\facade\Cache;

// 删除缓存
Cache::delete('key');

In the above code, the parameter of the delete method is the cache key, which is the name of the cache that needs to be deleted.

When doing modular development, you need to delete all cached data under a certain module. For example:

use think\facade\Cache;

// 删除某个模块下的全部缓存数据
Cache::clear('module');

In the above code, the parameter of the clear method is the module name, which is the module name that needs to be deleted. When performing a cache deletion operation, you need to ensure that the deleted cache name is consistent with the name when the cache was set, otherwise the set cache cannot be deleted.

3. Cache invalidation

In some cases, it is necessary to invalidate all cached data. In this case, the cache flush method needs to be used. For example:

use think\facade\Cache;

// 失效所有缓存数据
Cache::clear();

In the above code, the clear method without parameters can invalidate all cached data. When performing cache clearing operations, you need to operate with caution to avoid accidentally deleting cached data.

Summary:

When using thinkphp for development, caching is an important means to improve website performance. When the cache expires or the data changes, the cache needs to be deleted. thinkphp provides a method to clear the cache of a certain module or all modules, and to invalidate all cached data. When performing a cache deletion operation, you need to ensure that the deleted cache name is consistent with the name when the cache was set. When performing cache clearing operations, you need to operate with caution to avoid accidentally deleting cached data.

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