Disable javascript, go to the site and check if there is a "more"-button. Use the link from it to fetch new results.
EDIT: I disabled javascript and checked your url.
There is a "next" link at the bottom of the page:
http://www.flipkart.com/mobiles/~new-releases/pr?sid=tyy%2C4io&start=21&ref=436ee817-3fca-44b8-9b53-777f12126701
The &start=21
will be the necessary part for you to fetch new items. &start=41
etc
EDIT 2: So you didn't want to parse all existing items but rather get the item count.
preg_match('/class=\"items\">(.*?)</', $result, $match);
With this you should get the desired result. I did not tested it with the pagecontent itself. Let me know if it helped!