PHP Trait功能与用法实例分析

本文实例讲Beard什么意思述了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阳光总在风雨后作文-say'; }} class people{ u a,b{  a::eat insteadof b;  b::eat as eatbak;  b::say insteadof中国最好的医学院 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

<?phptrait test { public function say() 雅尼 春晚{  echo 'say hello'; }} class people { u 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:\phpdemo\trait_demo.php on line 14