douzhicui2209 2016-01-07 07:31
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如何在yii2中写出特征?

Traits are much more efficient than behaviors as behaviors are objects that take both time and memory.so can anyone explain how i can write trait in yii2 ?

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  • douti0467 2016-01-07 07:39
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    In General:

    A Trait is similar to a class, but only intended to group functionality in a fine-grained and consistent way. It is not possible to instantiate a Trait on its own.

    <?php
    trait Hello {
        public function sayHello() {
            echo 'Hello ';
        }
    }
    
    trait World {
        public function sayWorld() {
            echo 'World';
        }
    }
    
    class MyHelloWorld {
        use Hello, World;
        public function sayExclamationMark() {
            echo '!';
        }
    }
    
    $o = new MyHelloWorld();
    $o->sayHello();
    $o->sayWorld();
    $o->sayExclamationMark();
    ?>
    

    Use behavior then traits mainly for YII.

    Check this out:
    http://www.yiiframework.com/doc-2.0/guide-concept-behaviors.html#comparison-with-traits

    Reasons to Use Behaviors:

    Behavior classes, like normal classes, support inheritance. Traits, on the other hand, can be considered as language-supported copy and paste. They do not support inheritance.

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