A client asked me to develop a simple method for protecting a download (or digital product) by generating a unique URL that can be distributed to authorized users via email. The URL would contain a key that would be valid for a certain amount of time and number of downloads. The key will [...]

A simple page for testing the connection to a MySQL database. The PHP script will test the server address, username and password. If the database field is left empty, it will return a list of available databases. Testing a specific database is optional, but if a database name is supplied, it will [...]

I’ve been developing a PHP/MySQL web application that involves multiple users opening and editing records in the database. There is a very real possibility that two or more people will open the same record, make changes, and attempt to save these changes.
The most common concurrent execution problem that I expect to see is the [...]