PHP之Trait功能與用法實例分析

本文實例講述了PHP Trait功能與用法。分享給大家供大家參考，具體如下：

Trait 是為類似 PHP 的單繼承語言而準備的一種代碼復用機制。

1.如果引入的Trait有同名的方法

trait A{  public function eat(){   echo 'A-eat';  }    public function say(){   echo 'A-say';  } }   trait B{    public function eat(){   echo 'B-eat';  }    public function say(){   echo 'B-say';  } }   class People{  use A,B{   A::eat insteadof B;   B::eat as eatbak;   B::say insteadof A;  } }   $people = new People(); $people->eat(); echo "<br/>"; $people->say(); echo "<br/>"; $people->eatbak();

運行結果：

A-eat
B-say
B-eat

2.修改訪問控制

<?php trait Test {  public function say() {   echo 'say hello';  } }   class People {  use Test { say as protected; } }   $people = new People();   $people->say();

運行結果：

Fatal error: Call to protected method People::say() from context '' in D:phpdemotrait_Demo.php on line 14

相關學習推薦：PHP編程從入門到精通