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                ## trait 代碼復用,解決單繼承的限制。 語法: ``` trait A{ public function test1(){ echo "hello world"; } } class B{ use A; //繼承trait (用use) } ``` ## use ## 多個trait之間用 逗號隔開 ## 注意 trait不能被實例化 代碼使用如下: ~~~ <?php trait ABS{ public $a=100; function xiao(){ echo "你好呀啊"; } } trait Abbs{ public $b=200; function xi(){ echo "我是trait"; } } ------------------------------------------------------------------------------- class Yy{ use ABS,Abbs; //用use調入trait類 等于繼承了這2個類 public function xii(){ $this->xi(); //調用trait屬性和方法 $this->a; } } $bb=new Yy; //實例化類 $bb->xi(); //輸出值 echo $bb->a; ~~~
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