9/8/2023 0 Comments Php array length for loopIt’s the anonymous functions that we saw earlier. That said, there’s a third type of callable that became available with PHP 5.3. That’s because WordPress still as PHP 5.2 has a requirement. With WordPress, callables tend to take one of two forms: a string (like 'function_name') or an array (like array($object, 'method_name')). Callables are a PHP data type used to define a function or method that PHP can call. PHP callablesĪnd this brings us to the PHP concept of “ callables“. In functional programming, they’re not any different from strings or any other data types. But they can also return them as a result. Like we mentioned earlier, higher-order functions can take them as arguments. Meanwhile, anonymous functions only exist to serve these higher-order functions. The array functions that we’ll see today are all higher-order functions. These can be either other higher-order functions or anonymous functions. Higher-order functions are functions that can accept other functions as arguments. The second thing is that these functions come in two categories: higher-order and anonymous. You can’t have a function without any parameters or that doesn’t return a value. First, these functions always take an input and always generate an output. So what’s so special about these functions anyways!? Well, for us, there are two things that are important. Instead, these are functions that are closer to the mathematical ones mentioned earlier. But these aren’t the same functions that you use every day with PHP. That’s why this will only be a small overview of the topic.Īs the name suggests, functional programming revolves around functions. Like object-oriented programming, this isn’t an easy topic to cover. A lot of what we’ll see in this article revolves around it. This is where functional programming comes in. You can use both with mathematical functions. A vector is a one-dimensional array and matrix is a multidimensional array. In fact, they have two names: matrix and vector. They’re also something that you use in mathematics especially with linear algebra. You can then use the index value or the key to retrieve the value back.īut arrays aren’t just a thing in computer science. The array stores each value at a specific location using either an index or a key-value pair. In that context, arrays are still a data type used to store a collection of values. Instead, we want to look at them in the larger context of computer science and mathematics. Now, we don’t want to look at the concept of arrays just in PHP. They’ll help you understand what we’re doing when we’re replacing loops by array functions. These are foundations on which the article rests. This, in turn, makes their code simpler, easier to read and more testable.īefore we begin, let’s take a moment to go over a few concepts. They’re used by PHP experts to make their life easier and replace a lot of instances where you’d use a loop. That’s because loops, while easy to use, can also make your code much more complex.īut, lucky for us, PHP has a wealth of array functions. When that happens, your code becomes hard to read and to test. They let you traverse an array and perform any operation that you wish on each array element. That’s because, when we work with arrays, we also tend to work with loops as well. But that doesn’t mean that you’re using them to their full potential. They’re an essential (if not necessary) part of your developer toolbox. If you’re just looking for the slides, click here.Īs a WordPress or PHP developer, you use arrays all the time. This is the companion article that I wrote for it. I gave a talk at WordCamp Los Angeles 2016 on PHP array functions.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |