Get monthly performance systems

i have using c2 api and wants to integrate in PHP code,so i have carefully studied the provided api documentation,but unable to reach the function from it we can get monthly performance of systems for 2-3 years like data showing in PIPALERT.

Look at the C2 Data Services API (url is http://www.collective2.com/C2DS.pdf ), and in particular look at the getequityseries command.