php的trait使用

从php5.4开始，为了解决单继承的问题，除了通过implments来实现多接口外，官方提供了一个trait来解决该问题。

<?php
//示例

trait Dog{
    public $name = "dog";
    public function run(){
        echo "This is $this->name run\r\n";
    }

    public function eat(){
        echo "This is $this->name eat\r\n";   
    }
}

class Animal{
    public function run(){
        echo "This is animal run\r\n";
    }
}

class Cat extends Animal{
    use Dog;
    public function run(){
        echo "This is cat run\r\n";
    }
}

$cat = new Cat();
$cat->run();

$cat->eat();

$dog = new Dog();
$dog->run();

?>

从以上看出，对象调用的优先级为【本类(子类)>trait>基类(父类)】