Install PHP on Ubuntu

Install PHP

Install the PHP Packages

sudo apt-get install php5

As of Ubuntu 12 (an maybe even earlier), the installer will automatically restart Apache2 for you.

Verify

Quickly verify that everything works by creating a php info file with your favourite editor,

sudo vi /var/www/info.php # On public site do not use such an obvious file name

Put in the following contents,

<?php
phpinfo();
?>

Save the file and browser to file using a browser. You can use either the IP Address or the valid Domain Name. For example, http://173.194.75.94/info.php or http://www.krypton.com/info.php which should show a purple and grey PHP informational screen.

Secure the Server

suPHP, LiteSpeed Web Server

Determine if this actually increases security - http://www.suphp.org/Home.html. It seems to make the most sense for shared hosting.

This article indicates that suphp is slow as it makes php run as a cgi. Instead it recommends restrictions using mod_php - http://serverfault.com/questions/279938/should-i-use-suphp-or-mod-php-for-shared-hosting. Along this thread another poster recommends, http://mpm-itk.sesse.net/ which allows vhosts to be run under different uid and gid.

This restricts the php process to specific directories - http://help.godaddy.com/article/1616

Install MySQL

sudo apt-get install mysql-server

For the root administration database password, use the standard password algorithm based on the server name.

Connect PHP to MySQL

sudo apt-get install php5-mysql

Create the Accounts in MySQL

Connect into MySQL,

mysql -u root -p

Enter the following MySQL commands,

CREATE DATABASE wordpresskryptondb;
GRANT ALL PRIVILEGES ON wordpresskryptondb.* TO "wpkryptonuser"@"localhost" IDENTIFIED BY "password";
FLUSH PRIVILEGES;
EXIT

Explain variables on a table, wordpresskryptondb, wpkryptonuser, localhost, password.

FAQ

Why do some of the php5 installations say to use install libapache2-mod-php5?

No need, it is included with the php5 package.

What is the difference between the php5 and libapache2-mod-php5 packages?

Nothing I can see. It just looks like php5 is an overarching package name.

References

Ubuntu Server Documentation - https://help.ubuntu.com/12.04/serverguide/php5.html

Has some ok details around suPHP - https://help.ubuntu.com/community/ApacheMySQLPHP#Installing_MYSQL_with_PHP_5

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