Below are some interesting problems and solutions that I have come accross. Problem: In a web based system how to you prevent multiple updates to the same record by different users seeing potentially different data. This is a play on the old airline reservation problem you find in older computer science text books. If there is one ...
Problem: In most web based system one of the most commonly used process is user authentication and page access. This Login function is pretty typical here’s my example: Notice I set a bunch of session variables that I frequently use later in the application to display specific user information (such as dashboards etc.) <?php /////// ...
Problem: Web form spam or bot induced form submissions is a common issue these days on we pages that have forms. The simplest way to thwart such spam is to use a captcha. There are many varieties of captcha but today I’m going to focus on some simple code that does the job quickly and ...
