Tut's Simple Search engine is a search engine script written in pure PHP. It searches and finds the results from a MySQL database. The PHP script can be implemented by Website owners into their own websites allowing their users to search for website links saved in the database and quickly browse to the page the users wants. If you are thinking about using this as a complete search engine script then you will need a bot too that would save crawled links into the database.
Additional  note:
Note: You need to add your own database details to connect to the MySQL Database in the connect.php file included in the ZIP file.