Install HipHop Virtual Machine on Ubuntu 14.04

Hello Guys,
Yesterday during a conversation  with my old friend I come across a  about the HHVM server. so I started looking for it. and as an Linux Administrator I want to know how I can install this and configure this. So here is a procedure.
steps required to install HHVM on Ubuntu 14.04 

The article will also illustrate how HHVM can be used by creating:

1. A command line 'Hello World' script in PHP
2. A web based 'Hello World' script written in PHP and served by the HHVM server

Prerequisites

The only prerequisite for this tutorial is a VPS with Ubuntu 14.04 x64 installed. Note that HHVM doesn't support any 32 bit operating system and they have no plans to add support for 32 bit operating systems.

What is HHVM?

HipHop Virtual Machine (HHVM) is a virtual machine developed and open sourced by Facebook to process and execute programs and scripts written in PHP. Facebook developed HHVM because the regular Zend+Apache combination isn't as efficient to serve large applications built in PHP.

According to their website, HHVM has realized over a 9x increase in web request throughput and over a5x reduction in memory consumption for Facebook compared with the Zend PHP engine + APC (which is the current way of hosting a large majority of PHP applications).

Installing HHVM

Installing HHVM is quite straightforward and shouldn't take more than a few minutes. Executing the following 4 commands from the command line will have HHVM installed and ready:

sudo -i && wget -O - http://dl.hhvm.com/conf/hhvm.gpg.key | apt-key add -
echo deb http://dl.hhvm.com/ubuntu trusty main | tee /etc/apt/sources.list.d/hhvm.list
apt-get update
apt-get install hhvm

To confirm that HHVM has been installed, type the following command:

hhvm --help

Integrating your HHVM with existing infrastructure well HHVM  stop supporting the build in web-server so we need to integrate it with apache2 or with NGINX two most popular web servers.

Using HHVM in the FastCGI Mode

Starting with version 3.0, HHVM can no longer be used in the server mode. This section will help you configure HHVM in the FastCGI mode with the Apache and Nginx servers.

With Apache

Configuring HHVM to work in the FastCGI mode with Apache is extremely simple. All you need to do is execute the following following script:

/usr/share/hhvm/install_fastcgi.sh

Running this script configures Apache to start using HHVM to process the PHP code. It'll also restart the Apache server so you don't have to do anything else.

With Nginx

If you are using Nginx with PHP-FPM, you'll have to modify the configuration file to disable the use of PHP-FPM. This file is normally located at /etc/nginx/sites-available/default

Look for the following section and make sure it's all commented (by adding a # at the beginning of each line)

# pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
#
#location ~ \.php$ {
#       fastcgi_split_path_info ^(.+\.php)(/.+)$;
#       # NOTE: You should have "cgi.fix_pathinfo = 0;" in php.ini
#
#       # With php5-cgi alone:
#       fastcgi_pass 127.0.0.1:9000;
#       # With php5-fpm:
#       fastcgi_pass unix:/var/run/php5-fpm.sock;
#       fastcgi_index index.php;
#       include fastcgi_params;
#}

After doing this, execute the following script:

/usr/share/hhvm/install_fastcgi.sh

after execting the script we need to make a small change in file  /etc/apache2/mods-enabled/hhvm_proxy_fcgi.conf. replance the exesting line 

ProxyPassMatch ^/(.+\.(hh|php)(/.*)?)$ fcgi://127.0.0.1:9000/var/www/$1

with

ProxyPassMatch ^/(.+\.(hh|php)(/.*)?)$ fcgi://127.0.0.1:9000/var/www/html/$1e 

and we are done start the apache web server

Executing this script configures Nginx to start using HHVM to process the PHP code. It'll also restart the Nginx server so you don't have to do anything else.

Confirming that Apache/Nginx is Using HHVM

After you have configured your server to start using HHVM, it's always a good idea to confirm that the server (Apache or Nginx) is indeed using HHVM to process PHP.

You can do this by creating a test PHP file, let's say info.php and putting it in the public folder of your server (typically /var/www/html for Apache and /usr/share/nginx/html for Nginx). Now put the following content in this file:

<?php

echo  defined('HHVM_VERSION')?'Using HHVM':'Not using HHVM';

Now if everything is set up fine, when you access this file in the browser, you should see the following message:

Using HHVM

Important Note

HHVM has incorporated a lot of commonly used PHP extensions, making it easy to port a large number of applications without much fuss. However, if an application uses a PHP extension that hasn't been incorporated yet, choosing HHVM will break the application. The complete list of PHP extensions that have been ported over to HHVM can be found here