PHP 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:\phpdemo\trait_Demo.php on line 14