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Posts tagged with traits

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How to call an overridden trait function original

by Freek Van der Herten – 3 minute read

Traits are a wonderful thing in PHP. You can use them to reduce code duplication by putting common functions in a trait and apply them to all classes where those functions are needed. I also sometimes use traits to break up a large function in multiple single-use traits.

In this post, I'd like to show you how you can override a trait function and call it from the overriding function.

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Understanding Laravel's macroable trait

Nicola Malizia wrote a short blog post on how Laravel's handy Macroable trait can be used and how it works under the hood.

If you check the Laravel codebase I’m sure that you can observe that Laravel makes use of traits.There is one trait in the source code that pulls my attention. I’m talking about the Macroable trait. ... The purpose of this trait is to extend (not in an OOP sense) a class at run-time. This way, you can add behavior without editing the original class source code.

https://unnikked.ga/understanding-the-laravel-macroable-trait-dab051f09172

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Method overloading is possible in PHP (sort of)

PHP does not support method overloading. In case you've never heard of method overloading, it means that the language can pick a method based on which parameters you're using to call it. This is possible in many other programming languages like Java, C++.

So, under normal circumstances, you can't do this in PHP:

class Foo
{
   function bar(A $baz)
   {
      ...
   }

   function bar(B $baz)
   {
      ...
   }
}

However, with some clever coding, Adam Wathan made a trait, aptly called Overloadable, that makes method overloading possible. It works by just accepting any parameters using the splat operator and then determining which of the given functions must be called according to the given parameters.

Let's rewrite that example above using the Overloadable trait.

class Foo
{
    use Overloadable;

    function bar(...$arguments)
    {
        return $this->overload($arguments, [
            function (A $baz) {
               $this->functionThatProcessesObjectA($baz);
            },
            function (B $baz) {
               $this->functionThatProcessesObjectB($baz);
            },
        ]);
    }
}

Pretty cool stuff. In a gist on GitHub Adam shares a couple of examples, the source code of the trait and the tests that go along with it. Check it out!

https://gist.github.com/adamwathan/120f5acb69ba84e3fa911437242796c3

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In Search of an Anonymous Class Factory

Mark Baker tried creating an Anonymous Class Factory.

I was intrigued by a request to find a way of dynamically applying Traits to a class at run-time. With time on my hands as I was sitting in the airport, I considered the problem; and my first thought was to build an Anonymous class, extending the requested class (so that it would still contain all the base properties and functionality, and could be type-hinted, but also applying the requested Trait or set of Traits.

https://markbakeruk.net/2016/05/03/in-search-of-an-anonymous-class-factory/

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Optional Value Control-flows in PHP using Traits and Magic-methods

Edd Mann demonstrates a nice trait to add OrElse functionality to a class via a trait. With it you can do things like:

[code]

$cart = $repository->findByIdOrElse(1, new ShoppingCart); $cart = $repository->findByIdOrElse(1, function () { return new ShoppingCart; });



<a href="http://tech.mybuilder.com/optional-value-control-flows-in-php-using-traits-and-magic-methods/">http://tech.mybuilder.com/optional-value-control-flows-in-php-using-traits-and-magic-methods/</a>

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