Application of PHP functions in caching

PHP cache functions improve performance by storing data in memory, including memcache(), memcache_connect(), memcache_set(), and memcache_get(). Memcached installation and configuration steps include installing, starting, and enabling auto-start on Ubuntu. A practical example demonstrates how to use PHP caching functions to get and store data from Memcached to connect to the server, store key-value pairs, and retrieve values.

Application of PHP functions in caching

Caching is a key technology to improve performance in web development. It can make frequent visits The data is stored in memory, thus avoiding repeated access to the database or other data sources. PHP provides a variety of built-in functions for caching data, simplifying cache implementation.

Commonly used PHP caching functions

• memcache(): Used to access the Memcached cache engine.
• memcache_connect(): Connect to the Memcached server.
• memcache_set(): Store data to Memcached.
• memcache_get(): Get data from Memcached.

Installation and Configuration

Before using Memcached, you need to install and configure it. The following steps cover installing and configuring Memcached on Ubuntu:

1. Install Memcached: sudo apt-get install memcached
2. Start Memcached: sudo systemctl start memcached
3. Enable automatic startup:sudo systemctl enable memcached

Practical case

The following code Demonstrates how to use PHP caching functions to fetch and store data from Memcached:

<?php
// 连接到 Memcached 服务器
$memcache = new Memcache;
$memcache->connect('localhost', 11211);

// 将数据存储到 Memcached
$memcache->set('key', 'value', 0, 3600);

// 从 Memcached 中获取数据
$value = $memcache->get('key');

echo $value;
?>

In this case, we connect to the local Memcached server and store the key-value pair 'key' and 'value' into the cache (valid for 3600 seconds), the value is then retrieved from the cache and displayed.

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