What to do if thinkphp s cache is lost

When developing using the ThinkPHP framework, we often use caching to improve website performance and response speed. However, sometimes cache loss problems are discovered, which can seriously affect the website's operating efficiency and user experience.

This article will explore the causes and solutions of cache loss in the ThinkPHP framework.

Reason 1: Cache time expired

The caching system in the ThinkPHP framework supports multiple types of caching, such as file caching, Redis caching, etc. When setting up the cache, we can set the validity time of the cache. During this time, the cache will take effect. After this time, the cache will expire.

When the cache time expires, the next time the cache is called, the data will be re-obtained from the database or other data sources and re-stored in the cache, which will cause the data previously stored in the cache to be lost. .

Solution: Adjust the cache time

We can determine whether the cache has expired by checking the cache's validity time. When the cache expires, we can avoid cache loss by resetting the cache time. , for example:

$key = 'user_info';
$user_info = cache($key);
if (!$user_info) {
    //缓存不存在，从数据库中获取数据
    $user_info = Db::name('user')->where('id', 1)->find();
    //设置缓存并设置有效时间为10分钟
    cache($key, $user_info, 600);
}
return $user_info;

In the above code, when the cache does not exist, we get the data from the database and store it in the cache, and set the validity time to 10 minutes, if the cache already exists but expired , then when the cache function is called, the system will automatically store the newly obtained data in the cache and reset the validity time, thus avoiding cache loss.

Cause 2: The cache is cleared

In addition to the expiration of the cache time, we may sometimes manually clear the cache or automatically clear the cache through a system script, which will result in the data previously stored in the cache is cleared and can no longer be obtained.

Solution: Avoid accidentally deleting the cache

We can avoid accidentally deleting the cache by classifying the cache or setting an independent key value for each cache, for example:

//分类缓存
$key = 'user_info_' . $user_id;
$user_info = cache($key);

//独立键值
$key = 'user_info';
$user_info = cache($key . '_' . $user_id);

In the above code, we avoid accidentally deleting caches by classifying caches or setting independent key values, so that even if a cache is accidentally deleted, other caches will not be affected.

Reason 3: Insufficient cache storage space

When using the cache, we need to consider the storage space occupied by the cache. If the storage space is insufficient, the cache will be lost.

Solution: Increase the cache storage space

We can avoid cache loss by increasing the cache storage space, for example:

//使用Redis缓存
$redis = new Redis();
$redis->connect('127.0.0.1', 6379);
$redis->setOption(Redis::OPT_SERIALIZER, Redis::SERIALIZER_PHP);
$redis->setOption(Redis::OPT_PREFIX, 'thinkphp_');

//设置Redis最大内存为512MB
$redis->config('SET', 'maxmemory', '512mb');

//获取当前Redis使用的总内存和剩余内存
$used_memory = $redis->info('memory')['used_memory'];
$free_memory = $redis->info('memory')['maxmemory'] - $used_memory;

//调整缓存存储空间
if ($free_memory < 1024 * 1024 * 100) {
    $redis->config('SET', 'maxmemory', '1024mb');
}

In the above code, we use Redis cache , and set its maximum memory to 512MB. After obtaining the total memory and remaining memory currently used by Redis, if the remaining memory is less than 100MB, adjust the maximum memory to 1GB, so as to avoid cache loss due to insufficient storage space.

In summary, cache loss is a common problem, but by properly setting cache time, classifying cache, and increasing cache storage space, we can effectively avoid cache loss and improve website performance and response. speed.

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