"dbaction.php" file contains a script that is verifying if the script can connect to the database. You have to modify this
mysql_select_db("searchdb");
"searchdb" is the database name. Modify it with your own databse name that exist on your server.
The file search.sql contains the database and the tables with all data. You have to compile this file on your server, for this you can use PhpMyAdmin.
To lunch the search engine use "engine.php".
Try it.
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If you have questions please ask here.