参考:https://www.cnblogs.com/yulongcode/p/11524193.html
一个类可以组合多个Trait,通过逗号相隔,如下
use trait1,trait2
当不同的trait中,却有着同名的方法或属性,会产生冲突,可以使用insteadof或 as进行解决,insteadof 是进行替代,而as是给它取别名
trait trait1{
public function eat(){
echo "This is trait1 eat";
}
public function drive(){
echo "This is trait1 drive";
}
}
trait trait2{
public function eat(){
echo "This is trait2 eat";
}
public function drive(){
echo "This is trait2 drive";
}
}
class cat{
use trait1,trait2{
trait1::eat insteadof trait2;
trait1::drive insteadof trait2;
}
}
class dog{
use trait1,trait2{
trait1::eat insteadof trait2;
trait1::drive insteadof trait2;
trait2::eat as eaten;
trait2::drive as driven;
}
}
as 还可以修改方法的访问控制
<?php
trait Animal{
public function eat(){
echo "This is Animal eat";
}
}
class Dog{
use Animal{
eat as protected;
}
}
class Cat{
use Animal{
Animal::eat as private eaten;
}
}
$dog = new Dog();
$dog->eat();//报错,因为已经把eat改成了保护
$cat = new Cat();
$cat->eat();//正常运行,不会修改原先的访问控制
$cat->eaten();//报错,已经改成了私有的访问控制
?>