{
//在抽象方法前面添加abstract关键字可以表明这个方法是抽象方法 不需要具体实现
public abstract function eat($food);
//抽象类中可以包含普通方法，有方法的具体实现。
public function breath()
{
echo "Breath use the air \n <br/>";
}
}
//继承抽象类的关键字是extends
class Human extends ACanEat
{
//继承抽象类的子类需要实现抽象类中定义的抽象的方法
public function eat($food)
{
echo "Human eating " . $food . "<br/>";
}
}
class Animal extends ACanEat
{
public function eat($food)
{
echo "Animal eating " . $food . "<br/>";
}
}
$man = new Human();
$man->breath();
$man->eat("apple");
$animal = new Animal();
$animal->breath();
$animal->eat("bananer");
public abstract function eat($food);
public function breath()
{
echo "Breath use the air.\n";
}
}
// Human类实现了ICanEat接口
class Human extends ACanEat
{
// 跟Animal类的实现是不同的
public function eat($food)
{
echo "Human eating " . $food . "\n";
}
}
// Animal类实现了ICanEat接口
class Animal extends ACanEat
{
public function eat($food)
{
echo "Animal eating " . $food . "\n";
}
}
$man = new Human();
$man->eat("Apple");
$man->breath();
// 和Animal共用了抽象类ICanEat的breath方法
$monkey = new Animal();
$monkey->eat("Banana");
$monkey->breath();
