What is the php caching method?

php caching methods are: 1. File caching; 2. Using Memcached, a high-performance distributed memory object caching system; 3. Using Redis; 4. Using APC's open and free PHP opcode caching.

The operating environment of this tutorial: Windows 7 system, PHP version 5.6, DELL G3 computer. This method is suitable for all brands of computers.

php caching method is:

1. File caching (not much to say, this).

2. Memcached is a high-performance distributed memory object caching system used in dynamic web applications to reduce database load. It improves the speed of dynamic, database-driven websites by caching data and objects in memory to reduce the number of database reads. Memcached is based on a hashmap that stores key/value pairs. Its daemon is written in C, but the client can be written in any language and communicates with the daemon through the memcached protocol. PHP has a memcached extension, which can be used after installation.

// 初始化
$cache = new Memcache();
$cache->pconnect(CACHE_HOSTNAME, CACHE_PORT);
// 写入
$cache->set(CACHE_PREFIX . $key, $value, MEMCACHE_COMPRESSED, $expire);(CACHE_PREFIX 为了避免命名冲突，最好加一个前缀，MEMCACHE_COMPRESSED一个标记，设置为0表示不压缩)
// 读取
$cache->get(CACHE_PREFIX . $key);
// 删除
$cache->delete(CACHE_PREFIX . $key);

3. Redis is an open source log-type Key-Value database written in ANSI C language, supports network, can be memory-based and persistent, and provides APIs in multiple languages. Similarly, install the php extension // Initialize $cache = new Redis();

// 初始化$cache = new \Redis();
$cache->connect(CACHE_HOSTNAME, CACHE_PORT);
// 先检查是否存在，然后写入并设置有效时间
if($cache->exists($key)){　　
    $cache->delete(CACHE_PREFIX . $key);
}
$cache->set(CACHE_PREFIX . $key, serialize($value));
$cache->expire(CACHE_PREFIX . $key, $expire);
// 读取
$cache->get(CACHE_PREFIX . $key);

4. APC

Alternative PHP Cache (APC) is an open and free PHP opcode cache. Its goal is to provide a free, open, and sound framework for caching and optimizing PHP intermediate code.

I tried this for a long time without success. Windows reported an error as soon as I started it. Make a note of it and try again later.

Built-in in php, there is no need to initialize the connection like the above two.

// 写入
apc_store(CACHE_PREFIX . $key, $value, $expire);
// 读取
apc_fetch(CACHE_PREFIX . $key);
// 删除
apc_delete(CACHE_PREFIX . $key);

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