Creating our first hello world module

While theory is interesting, we can discover more by actually coding our whhelloword module. A practical example is better than thousands of explanations!

In the /modules/whhelloworld/whhelloworld.php file, let’s define the module class:

• The first mandatory point is that the module class must use the technical name. But as PHP class names often start with a capital letter, the class name can use a camelcased version of the technical name with a capital letter for the second one. The camelcased version often improves the meaning of objects’ names.

We will create the WHHelloWorld class for our module.

• The second mandatory point is that this module class must extend the Module class or one of its child classes. As PaymentModule and CarrierModule are both child classes of Module, our module could extend one of them too.

Taking into account these constraints, let’s declare our Module class. It should...