different method when install php

different method when install php

I want to install LNMP(Linux, Nginx, php and MySql) on my ubuntu.
I googled,but I found severals diff methods for installing php although
they all used apt-get.
This made me doubt.
Some one used:
apt-get install php5
Some one used:
apt-get install php5-pfm
and some one used:
apt-get install php5-common php5-cli php5-fpm
I do not know the diff of these methods, can some one tell me?