Use PHP to operate Memcached database

Memcached is a high-performance distributed memory object caching system that can help developers reduce the burden on the server through caching, thereby improving the operating efficiency of web applications. PHP is a widely used server-side programming language that can interact with Memcached to implement read and write operations on the cache.

This article will introduce how to use PHP to operate the Memcached database, including installing Memcached extensions, connecting to the Memcached server, setting cached data, obtaining cached data, deleting cached data, etc.

1. Install Memcached extension

Before using PHP to operate Memcached, you need to install the Memcached extension. It can be installed on Ubuntu by following these steps:

1. Open a terminal and enter the following commands to install the necessary packages

sudo apt-get update
sudo apt-get install libmemcached-dev build-essential php-dev

2. Install the php-memcached extension

sudo pecl install memcached

3. Add the extension to the PHP configuration file

Under Ubuntu 18.04, use the following command to open the php.ini file and add the memcached extension:

sudo nano /etc/php/7.2/cli/php.ini

Add the following code at the end of the file:

extension=memcached.so

Save and exit the file, and then restart the PHP-FPM service.

2. Connecting to the Memcached server

You need to use the Memcached class to connect to the Memcached server. The following code shows how to create a Memcached instance and connect to the local server:

<?php
$memcached = new Memcached();
$memcached->addServer('localhost', 11211);
?>

In the addServer method, the first parameter represents the IP address of the Memcached server, and the second parameter represents the port number of the Memcached server. The default is 11211.

3. Setting cache data

To set cache data, you need to use the set method of the Memcached class. The following is an example of setting cache data using PHP:

<?php
$memcached->set('key', 'value');
?>

In the set method, the first parameter is the cache key, and the second parameter is the cache value. If you need to set the cache expiration time, you can pass the third parameter in the set method to represent the expiration time, in seconds. For example:

<?php
$memcached->set('key', 'value', 600);
?>

In this example, the cache expiration time is set to 600 seconds (10 minutes).

4. Obtain cache data

To obtain cache data, you need to use the get method of the Memcached class. The following is an example of using PHP to obtain cached data:

<?php
$value = $memcached->get('key');
?>

In the get method, the parameter is the cache key. If the corresponding cache value does not exist in the cache, false is returned.

5. Delete cached data

To delete cached data, you need to use the delete method of the Memcached class. The following is an example of deleting cached data using PHP:

<?php
$memcached->delete('key');
?>

In the delete method, the parameter is the cache key. If you want to delete all cached data, you can use the flush method:

<?php
$memcached->flush();
?>

6. Summary

Through the Memcached extension and the corresponding PHP code, we can easily use PHP to operate the Memcached database. Using Memcached caching can significantly improve the performance of web applications, reduce server burden, and improve user experience. By learning and mastering the use of Memcached, we can better develop high-performance web applications.

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