How to do property search using rets XML with PHP

I have RETS configured and downloaded complete data on my live server. I want someone helps to figure me out how to do search data from the RETSdata.

Suppose, from the search form I choose, 2 beds, price ranges 100000 and 3 bath rooms. Now, I want to query this data from RETS XML and show the results based on this search criteria.

Can anybody give me direction. I have all the XML data saved on the server. Now I want to query the data based on the search criteria i will post on XML file.