#!/bin/python

import os, sys


old = "www.example.com"
new = "subdomain.example.com"

recursive = os.popen("find ./ -name '*.php'").read().split("\n")

for n in recursive:
    name = n.strip()
    if len(name) == 0:
        continue

    handle = file(f, "rw")
    f.write(f.read().replace(old, new))