If you are familiar with blogosphere you know what is Technorati.
Technorati is an Internet search engine for searching blogs. You can submit your blog to Technorati and ping their servers when your blog site is updated. when you ping Technorati their web crawlers read the updated information on your site.
Technorati offers an XML-RPC ping web service to allow blogs to notify content changes.
In this article we discuss how to write a PHP script to programatically ping Technorati when there is new content in your site.