After you enter a search query, the script parses the query to the Google server. Google returns 10 results and the script formats them. to connect with Google, This script uses the nusoap library from Dietrich Ayala. You do need a (free) Google developer key by choosing create a google account at www.google.com/apis.
RiSearch PHP is effective and fully-functional search script for small and medium sites. It is fast enough to search 5000-10000 of pages in less then one second. RiSearch is indexing search engine, which means that it index your site first and creates a database with all words from your pages for faster search. Risearch is full-text search script and index all words of a document except small words and common words (this can be defined configuration file).
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