apt-get update
sudo apt-get install lighttpd php5-cgi
Enable the fastcgi module and the php configuration with
sudo lighty-enable-mod fastcgi
sudo lighty-enable-mod fastcgi-php
Reload the lighttpd daemon
sudo service lighttpd force-reload
To test if it's working create the file /var/www/index.php with the following contents:
<?php phpinfo(); ?>
and check out http://localhost/index.php in your browser.
apt-get install php5-mysql php5-curl php5-gd php5-intl php-pear php5-imagick php5-imap php5-mcrypt php5-memcache php5-ming php5-ps php5-pspell php5-recode php5-snmp php5-sqlite php5-tidy php5-xmlrpc php5-xsl