PHP之Trait功能与用法实例分析

本文实例讲述了PHP Trait功能与用法。分享给大家供大家参考，具体如下：

Trait 是为类似 PHP 的单继承语言而准备的一种代码复用机制。

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();

运行结果：

A-eat
B-say
B-eat

2.修改访问控制

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

运行结果：

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

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