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Lesson 10 - The flash-message mechanism

In the previous lesson, Securing templates, we modified our system to protect template variables right before they're printed. In today's tutorial, we'll add a mechanism that displays flash messages to a user.

Flash messages

On desktop operating systems like Windows, OS X, and Ubuntu, we're used to being notified about all sorts of events via message boxes. Naturally, we should introduce a similar mechanism to our website as well. We'll inform the user about important application states. Generally, there are two types of messages, success, and failure. Users are used to this sort of behavior, so it won't come as a surprise to them.


Displaying a message is rather simple. In desktop applications we would write something like this:

MessageBox.Show("Invalid password!");

In the MVC architecture, the flash message mechanism is implemented by


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In this tutorial, we'll add the flash-message mechanism to our object-oriented MVC CMS in PHP. We'll learn the template syntax for conditions and loops.

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Article has been written for you by David Capka
The author is a programmer, who likes web technologies and being the lead/chief article writer at He shares his knowledge with the community and is always looking to improve. He believes that anyone can do what they set their mind to.
Unicorn university David learned IT at the Unicorn University - a prestigious college providing education on IT and economics.