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Using Memcached in PHP

Discussion in 'PHP' started by pradeep, Jun 23, 2012.

  1. pradeep

    pradeep Team Leader

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    Memcached is a high-performance open-source caching solution, generally used to improve web application performance by avoiding round-trips to RDBMS, to know more about memcached read [THREAD=27372]Faster Webapps With Memcached[/THREAD].

    In this article we'll discuss about installing and using memcached in PHP. A PHP extension is available for working with memcached with requires the C libmemcached library to be present.

    Installing memcached PHP extension



    Download the latest release of PECL memcached PHP extension from http://pecl.php.net/package/memcached and unpack it.

    Compile & install. Now, you can check the availability of the extension using phpinfo().

    If you are running Ubuntu variant or Debian & running PHP 5, just run the following to install the PHP extension:

    Code:
    sudo apt-get install php5-memcached

    Usage



    Memcached PHP extension provides an OOP interface, which is very easy, follow the code sample below to get an idea of the usage.

    PHP:
    $memc = new Memcached();

    // assuming you have a memcached daemon running in the local system
    // port defaults to 11211
    // you may add multiple servers, memcached will auto-distribute keys between them
    $memc->addServer("localhost"11211);

    // set a value
    $memc->set("name""Pradeep");

    // get the value
    print $memc->get("name");
    That was a very basic example, next let us look at more advanced usage:

    PHP:
    $memc = new Memcached();

    $memc->addServer("10.20.1.2"11211);
    $memc->addServer("10.20.1.3"11211);

    // set a value & specify the data to expire in 5 mins
    $memc->set("name""Pradeep"60);

    // replace the value of the existing key, but not modifying the expiry time
    $memc->replace("name""Anjali");

    // append data to an existing value
    print $memc->append("name"," is cool!");

    // similaryly prepend
    print $memc->prepend("name","Dude ");

    // set mulitple items at once
    $data = array(
        
    'name.1' => 'Pradeep',
        
    'city.1' => 'Kolkata',
        
    'hobby.1.1' => 'Cycling',
        
    'hobby.1.2' => 'Photography'
    );

    // set the multi key-value pairs, and set to exipre 10 mins from now
    $memc->setMulti($datatime() + 600);

    // similarly get multiple keys at once
    $get_data $memc->getMulti(array('name.1''hobby.1.1''hobby.1.3'));

    Using Memcached for Session



    You may store user session data in Memcached instead of regular file handler, which make sessions faster & independent of the server where the request lands (in case you have multiple servers under a load balancer). Here's what you need to do to use memcached for session.

    In php.ini set the following:

    Code:
    session.save_handler = "memcached"
    session.save_path = "hostname:port"
    
    The session key names are prefixed with memc.sess.key.
     

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