摘要：class Cat{ public function run(){ return '猫在跑'; }}class Dog{ public function run(Cat $cat){ return
class Cat{
public function run(){
return '猫在跑';
}
}
class Dog{
public function run(Cat $cat){
return $cat->run();
}
}
$cat = new Cat;
$dog = new Dog;
echo $dog->run($cat);
