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In most cases PHP performance can slow down the performance of websites. To optimize and accelerate website performance you need to improve the PHP performance. For this purpose, you can use opcode cachers such as eAccelerator, APC, Memcached, XCache, etc. Personally, my favourite choice is XCache. XCache is a free, open source operation code cacher, it is designed to enhance the performance of PHP scripts execution on servers. It optimizes the performance by eliminating the compilation time of PHP code by caching the compiled version of code into the memory and this way the compiled version loads the PHP script directly from the memory. This will surety accelerate the page generation time by up to 5 times faster and also optimizes and increases many other aspects of php scripts and reduce website/server load. May not be 5 times faster, but it will definite improves the standard PHP installation with the opcode XCaher. This article explains how to setup and integrate XCache into PHP installation on a RHEL, CentOS, Fedora and Ubuntu, Linux Mint and Debian systems. Step 1: Installation of XCache for PHP Users who running an Red Hat based distributions, can able to install XCache through a package manager by enabling epel repository. Once you’ve enabled epel repository, you can use the following yum command to install it. RHEL/CentOS/Fedora # yum install php-xcache xcache-admin By default, XCache is available for Debian based distributions from the package manager. Therefore, you can install the XCache package by using the following apt-get command. Debian/Ubuntu/Linux Mint # apt-get install php5-xcache Step 2: Configuring of XCache for PHP The XCache.ini configuration file has couple of settings that I do recommend you to understand as they are vital to use in this plugin. The detailed information of XCache configuration settings can be found at XcacheIni. If you don’t want to change any settings, you can use default settings as they are good enough to use with XCache. RHEL/CentOS/Fedora # vi /etc/php.d/xcache.ini Debian/Ubuntu/Linux Mint # vi /etc/php5/conf.d/xcache.ini OR # vi /etc/php5/mods-available/xcache.ini Step 3: Restarting Apache for XCache Once you’re done with configuration settings, restart your Apache web server. # /etc/init.d/httpd restart # /etc/init.d/apache2 restart Step 4: Verifying XCache for PHP Once you’ve restarted web service, type the following command to verify XCache. You should see the XCache lines as shown below. # php -v Sample Output PHP 5.3.3 (cli) (built: Jul 3 2012 16:40:30) Copyright (c) 1997-2010 The PHP Group Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies with XCache v3.0.1, Copyright (c) 2005-2013, by mOo with XCache Optimizer v3.0.1, Copyright (c) 2005-2013, by mOo with XCache Cacher v3.0.1, Copyright (c) 2005-2013, by mOo with XCache Coverager v3.0.1, Copyright (c) 2005-2013, by mOo Alternatively, you can verify XCache by creating a ‘phpinfo.php‘ file under your document root directory (i.e. /var/www/html or /var/www). vi /var/www/phpinfo.php Next, add the following php lines to it and save the file. <?php phpinfo(); ?> Open a web browser and call the file like “http://your-ip-address/phpinfo.php“. You will see the following output screen shot. XCache Info Step 5: Enabling XCache Admin Panel for PHP By default the admin panel is protected with http-auth and in disabled state, if you’ve not set a password. To set user/password open the Xcache.ini file. But, first you have to create md5 password using following command. # echo -n "typeyourpassword" | md5sum Sample Output e10adc3949ba59abbe56e057f20f883e Now open Xcache.ini file add the generated md5 password. See the following example, add your own password md5 string. [xcache.admin] xcache.admin.enable_auth = On ; Configure this to use admin pages xcache.admin.user = "mOo" ; xcache.admin.pass = md5($your_password) xcache.admin.pass = "e10adc3949ba59abbe56e057f20f883e" The simplest way to do so is copying the whole directory xcache (admin was in older release) to your web root directory (i.e. /var/www/html or /var/www). # cp -a /usr/share/xcache/ /var/www/html/ OR # cp -a /usr/share/xcache/htdocs /var/www/xcache OR cp -a /usr/share/xcache/admin/ /var/www/ (older release) Now call it from your browser, a http-auth login prompt window will pop-up. Enter your user/pass in, and it’s done. http://localhost/xcache OR http://localhost/admin (older release) XCache 3.0 Newer Version XCache 3.0 Admin Panel XCache 2.0 Older Version XCache Admin Panel Reference Links XCache Homepage