How I use PHP generators to make my life easier

With the release of php 5.5 we got ourself a cool new language feature: generators. If you’re new to the concept I suggest you read the excellent blog post from Anthony Ferrara about this subject. In this post I’ll show an example of how I use generators in my every day work.

The other day I was working on a import of a large batch of vacancies from a remote system via a SOAP webservice (yes, C#.NET on the other side). The service returned a container containing the current resultset and a boolean value whether there where more results. Consider the following the classical approach without generators:

There’s fundamentally not much wrong with this approach. It works. But let me show a more elegant way of solving this issue which also brings more benefits to the table as you’ll see.

The GetAllVacanciesGenerator class

Take a look at this GetAllVacanciesGenerator who’s responsibility it is to do the cumbersome fetching of the results and notice the yield keyword turning it into a Generator:

The command is much cleaner now:

As you can see the command is looking pretty again. I love this kind of improvements. It’s also easy to test this seperate generator class:

This could also be done with implementing a Iterator but I think the generator is much more readable.

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