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SitePoint PHP Blog:
Using Traits in Doctrine Entities
December 09, 2014 @ 12:16:56

On the SitePoint PHP blog there's a recent post showing you how to use traits with Doctrine entities. PHP's traits allow for the inclusion of functionality into a class without having to extend another class or create an object to use it.

Since PHP 5.4.0, PHP supports a pretty way to reuse code called "Traits" - a set of methods that you can include within another class in order not to repeat yourself. You can read more about traits in previously published SitePoint posts: here, here and here. Today, I am going to show you how they can be used with Doctrine ORM in a Symfony Environment.

He shows how to create two basic Doctrine entities, in this case representing "Article" and "Comment" instances. He then creates the trait, a "TimestampableTrait" class that abstracts out the setting/updating of the create and updated date on the Doctrine record. He refactors the entities to use the trait and shows the results of the "schema create" command.

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traits doctrine entity tutorial introduction functionality

Link: http://www.sitepoint.com/using-traits-doctrine-entities/

Allan MacGregor:
Exploring Traits
March 17, 2014 @ 11:48:59

In his new post Allan MacGregor takes a look at a somewhat underused feature of PHP (since 5.4), traits. He talks about how they can help solve multiple inheritance issues and the power they can offer.

Languages like C++ or Python manage this problem by allowing inheritance from multiple classes, Ruby in the other hand uses Mixings to address this issue. Regardless of the technique the problem remains the same; Traits are another approach to this problem and are commonly used in the languages like Perl and Scala.

He includes an example of the standard PHP method for inheritance in classes via the normal "extends" handling. He refactors this into a setup using traits to "override" the single inheritance issues via a "Cat" trait included in the "Tiger" class providing the "roar" method inside the class context.

The best part about traits is that it makes sense from a structural point of view. [...] Traits are an incredible addition to the PHP language and we have only started to touch the surface.
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traits introduction multiple inheritance

Link: http://coderoncode.com/2014/03/17/exploring-traits.html

U
October 02, 2013 @ 10:56:28

For those that might have heard of traits (made available in newer versions of PHP, 5.4+) but haven't seen much of a practical application, this new post from Matthew Setter could help.

Here's the situation which prompted the use of them, in a nutshell. I had a custom view helper which performed some rather elementary date & time formatting, based purely on US standards. When I first wrote the ViewHelper, I wasn't aware of any other use case I'd have for it. So it made sense for it to be self-contained. Such is life however, as later in development the need did arise to do more date/time formatting. But this time, far removed from the view layer in a model. [...] So I weighed up my options and chose to go with Traits. I'll be honest, there was the new & cool factor to them as well - as well as an irresistible sense of simplicity in them.

He shares the actual trait code he implemented, making two simple methods - one for formatting date and another for formatting the time - for his views to use. He also includes examples of it in use. He also sought some feedback

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zendframework2 traits reuse view helper

Link: http://www.maltblue.com/php/using-traits-for-code-reuse-in-zend-framework-2

Benjamin Eberlei:
Traits are Static Access
April 12, 2013 @ 11:16:35

In a new post to his site Benjamin Eberlei shares an opinion about traits, noting that they're basically the same as static functionality when it comes to several things like coupling, not being testable and being a "global state" container.

I used to look forward to traits as a feature in PHP 5.4, but after discussions with Kore I came to the conclusion that traits are nothing else than static access in disguise. They actually lead to the exact same code smells. Familiar with the outcome of too much static use, we should reject traits as just another way of statically coupling your code to other classes.

He includes some code examples showing traits in use in an example controller to handle a simple redirect. He points out at least six different issues with just this simple implementation. He rewrites it as "static" code to help prove his point. He comes to the conclusion that, much like static methods, traits should be avoided and instead aggregation should be favored.

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traits static compare avoid example code

Link: http://www.whitewashing.de/2013/04/12/traits_are_static_access.html

The Coders Lexicon:
My Love / Hate Relationship With PHP Traits
February 11, 2013 @ 12:50:45

On the Coder's Lexicon site, there's a recent post talking about the author's love/hate relationship with PHP traits, a relatively new feature of the language that apps for more "drop-in" functionality similar to mixins in other languages.

When I saw the introduction of PHP traits in 5.4.0 I was eager to learn all about them and how they worked. [...] PHP traits, in my opinion, are handy and very flexible. I guess that is the "love" part of my relationship with them. [...] However, I feel that traits also meddle with a bit of the inheritance rules that have been proven time and time again. Is it possible to love as well as hate something at the same time?

He talks first about "the love" he feels for using traits in his code. He talks about their usefulness for geting around PHP's single inheritance structure and being able to "bolt on" functionality as needed. Then comes "the hate" of them, noting that in the wrong hands, they could lead to very messy and lazy coding practices (including the deadly diamond of death problem).

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love hate traits good bad example mixin opinion


PHPMaster.com:
PHP Traits Good or Bad?
January 21, 2013 @ 09:19:48

In this new post to PHPMaster.com, Callum Hopkins takes a look at one of the more recently added features of the PHP language, traits an tries to determine if they're a good or bad thing for PHP development.

In early March 2012, the PHP Group announced the release of PHP 5.4. Developer eagerly anticipated the release because of the many new features 5.4 would bring, the most sought after being traits. [...] Traits have have been generally accepted by the PHP development community, mainly because it's a feature that exists within other programming languages like Java, C++, and Python. [...] Are they a feature which will help raise the level of PHP development, or are they just a fad?

The starts with a few reasons why he thinks traits are bad like their potential for abuse and the difficulties that could be caused by using them instead of something like an interface. On the good side, though, he mentions things like allowing for "multiple inheritance" and their addition showing growth in the language.

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traits feature language introduction good bad


Gonzalo Ayuso:
Multiple inheritance with PHP and Traits
December 19, 2012 @ 13:17:48

Gonzalo Ayuso has a new post today showing how you can use traits in PHP to simulate a kind of multiple inheritance.

Multiple inheritance isn't allowed in PHP. [It's not] possible with PHP (in Java is not possible either), but today we can do something similar (is not the exactly the same) with Traits. Let me explain that: Instead of classes we can create Traits.

He includes a code example showing the creation of two traits, "Base1" and "Base2", that are implemented (via "use") and the calls to methods on each. He also points out the error condition and message that can come up when there's a conflict in the method names between two or more traits. This is relatively easy to solve with the mapping ability of the "use" statement (code example included for that too).

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multiple inheritance traits python example mapping use


Refulz.com:
Traits - Method Precedence and Conflict resolution
May 31, 2012 @ 10:07:25

On the Refulz.com site today they've posted a new tutorial looking at the use of traits and how to resolve conflicts and work with method precedence.

In our previous post about the multiple and nested traits, we read how nested and multiple traits can be used in a class. In such cases, there is a possibility of the same method name existing in the trait, and the class using the trait. Furthermore, the same method name might also be present in the parent class of the class using traits. It is important to understand how the precedence order works for such cases.

First they look at the precedence between classes and traits with the class always winning...unless the method is inherited from a parent class. They also mention the order when it comes to using the "insteadof" and "as" operators as a way to get around conflicts between traits.

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traits conflict resolution inheritance precedence insteadof as tutorial


Refulz.com:
Traits in PHP - Multiple and Nested Traits
May 28, 2012 @ 15:16:29

On the Refulz.com blog there's a new tutorial posted looking at traits (and nested traits) in PHP including examples of them in use and how to create your own.

Traits is a good new addition to PHP language. In our series about the new features of PHP 5.4, we reviewed the concept of Traits in PHP. The introductory article talks about what the traits are and what is the general syntax of Traits in PHP. The second article attempts to explain why we need traits.

The tutorial shows you how to define a custom trait use things like abstract methods, nesting them by making them "users" and how to use multiples at the same time (comma-separating).

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traits multiple nested tutorial abstract


Gonzalo Ayuso's Blog:
Inject dependencies via PhpDoc
April 10, 2012 @ 10:23:14

Gonzalo Ayuso has a new post to his blog looking at a method for injecting dependencies into your application's code based on comments in the PHPDocumentor-formatted comments of your methods.

Last month I attended to Codemotion conference. I was listening to a talk about Java and I saw the "@inject" decorator. I must admit I switched off my mind from the conference and I started to take notes in my notebook. The idea is to implement something similar in PHP. It's a pity we don't have real decorators in PHP. I really miss them. We need to use PhpDoc. It's not the same than real decorators in other programming languages. That's my prototype. Let's go.

All of the code you'll need to recreate his solution is included - a sample "User" class that needs a valid PDO object in a private "db" property, a "DocInject" class that parses the comments and, using a new feature of PHP 5.4 (traits), injects the needed functionality into the "User" class and creates/assigns the object.

You can see just the full code in these two gists on Github.

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phpdocumentor comment tutorial injection traits



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