Memcached is an open-source, high-performance, distributed, and in-memory caching system. It is used to speed up dynamic web applications by reducing the database load. In this answer, we will discuss how to use Memcached with PHP.
Before proceeding, make sure that you have installed the Memcached server and the PHP Memcached extension on your system. You can install the Memcached server on Ubuntu using the following command:
sudo apt-get install memcached
To install the PHP Memcached extension, run the following command:
sudo apt-get install php-memcached
Once you have installed both the Memcached server and the PHP Memcached extension, you can connect to Memcached from PHP using the
Memcached class provided by the PHP Memcached extension.
Here's a simple example of how to connect to a Memcached server and store a value in it using PHP:
In the above example, we first create a new instance of the
Memcached class. Then we add a server to the pool using the
addServer method. The first parameter to this method is the hostname of the Memcached server, and the second parameter is the port number (11211 is the default).
Finally, we store a value in Memcached using the
set method. The first parameter to this method is the key under which to store the value, the second parameter is the value to store, and the third parameter is the expiration time (in seconds).
To retrieve a value from Memcached, you can use the
get method of the
Memcached class. Here's an example:
In the above example, we retrieve the value of the key
'key' from Memcached using the
get method. If the key exists in Memcached, its value will be returned, otherwise the value
false is returned.
We then check if the value returned by
get is not equal to
false. If it is not equal to
false, we print the value, otherwise we print a message indicating that the key was not found in Memcached.
In this answer, we have discussed how to use Memcached with PHP. We have looked at how to connect to a Memcached server, store values in Memcached, and retrieve values from Memcached.