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starting out or you’re a seasoned pro, Commerce Bug will save you and your team hours everyday. Grab a copy UPDATED FOR MAGENTO 2! No Frills Magento Layout is the only Magento front end book you'll ever need. Get your copy today! understanding that they were a feature that allowed you to build iterators that didn’t require loading up a huge data structure with all your information. This also seemed to be the gist of most online generator tutorials. So, in the practical world of business programming where jamming everything into a giant PHP array is usually good enough, there wasn’t much of a need to understand generators. So imagine my surprise when I discovered that generators are actually an alternative to linear code flow. Or maybe you don’t need to Today we’re going to cover generators “from scratch”. By the end of this article you should be able to reason about any generator function in PHP and understand the flow of code when a generator is invoked. For now, pretend we didn’t tell you that generators are for building iterators. New Definition: Generators are a special type of function in PHP that always returns a Generator object. Generator function definitions are similar to regular function definitions, with one exception. Instead of using a return keyword, they use a yield keyword. Here’s a simple This program defines a function named myGeneratorFunction. This function doesn’t have a return value, but does include the keyword yield. (We’re not quite ready to explain what yield does, but if you like to read ahead it’s similar to the return keyword — we’ll Next, we call myGeneratorFunction, and as*ign its return value to a variable named (appropriately) $returnValue. Finally, we pas* If you aren’t familiar with generators, you might expect $returnValue to contain the value null. After all, myGeneratorFunction didn’t return anything. However, if you run the above program, you’ll see our function returned a object instantiated from the