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
希望本文所述对大家PHP程序设计有所帮助。
