Using cookie, prevent users from multiple submissions within 24 hours. Create a simple report page where users can see all the submissions and filter it by date range and/ or user id.

Or, maybe you want to search the subject line and the content of a set of forum posts for certain keywords. Query multiple columns in a mySQL database using PHP to issue the mySQL commands.

First, create an entry HTML form capable of passing information to a secondary file. Next, create a Hypertext Preprocessor (PHP) file to accept the data and insert it into the database.