APCu vs Memcached: Choosing the Best PHP Caching Solution

In PHP development, caching technology is the key to improving performance. APCu and Memcached are both popular PHP caching solutions, but each has its own pros and cons. APCu is a lightweight, local caching solution suitable for use on a single server; while Memcached is a distributed memory object caching system suitable for multiple servers to work together. PHP editor Xinyi will discuss with you the characteristics, usage scenarios of APCu and Memcached and how to choose the PHP caching solution that is most suitable for your project.

APCu (Alternative PHP Cache) is an in-memory cache embedded in the php kernel, which was introduced in PHP version 5.5. APCu is a very fast caching solution especially suitable for storing small data objects such as session data and page cache.

Memcached is a distributed memory caching system that connects to PHP applications over a network . Memcached is more flexible than APCu, can store large amounts of data, and can scale across multiple servers.

Compare APCu and Memcached

feature	APCu	Memcached
Install	Built-in-PHP	Requires installation
speed	very fast	Depends on network delay
capacity	Relatively small	Very big
Scalability	Not scalable	Scalable across multiple servers
Persistence	Non-persistence	Can be configured for persistence
Support objects	support	not support

Choose the right choice

Choose APCu or Memcached depending on your specific application needs:

• APCu is an excellent choice for applications that require fast access to small data objects and do not require scalability.
• Memcached is a better choice for applications that need to store large amounts of data or need to scale across multiple servers.

Sample code

APCu:

<?php
// 在 PHP 脚本中使用 APCu
$cache = new ApcuCache();
$cache->set("key", "value");
$value = $cache->get("key");
?>

Memcached:

<?php
// 在 PHP 脚本中使用 Memcached
$memcached = new Memcached();
$memcached->addServer("localhost", 11211);
$memcached->set("key", "value");
$value = $memcached->get("key");
?>

in conclusion

APCu and Memcached are two powerful PHP caching solutions with different pros and cons. By understanding their differences, you can choose the solution that best suits your application needs. APCu is an excellent choice for applications that require fast access to small data objects and do not require scalability. Memcached is a better choice for applications that need to store large amounts of data or need to scale across multiple servers.

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