Observer Pattern

Before you start studying the tutorial on events at here, I highly recommend that you understand the Observer Pattern. Then you'll get easier the idea of events in the Shopware framework.

Basic idea of the Observer Pattern:
When an event is fired, it notifies the listeners that are subscribed to it.

Note: listeners can return values and the values can affect the operation of Web pages. For example, a boolean value (true/false) returned by a listener can cause a Web page to get rendered or not (see the example in the section Controller Actions of the tutorial).




Here's a good article that explains the Observer Pattern with a piece of code in JavaScript as an example. Please don't dig deep the code. Capture only the concept of the pattern.

Here's a good link that explains how to use XDebug for debugging PHP code.

PHP configuration file (socalled php.ini) in the UwAmp server is located at UwAmp\bin\php\CURRENT PHP VERSION\php_source.ini. Why is it called php_source.ini? Why do we need this file while we have php.ini under UwAmp\bin\apache??

UwAmp provides a local server. User and server connect to each other through the port 80.
Note: add the local server to PHPStorm.

Basics of plugin development in Shopware

- Specify the Web page of your website that you want to modify.
- Specify an event e that if it's triggered the Web page can be modified.
- Define an event listener function. By the argument of this function we have access to the current state s1 of the Web page.
- After execution of the event listener function, the state of the Web page will change to s2.

A little playful!

Shopware