PHP Dog::walk方法代码示例

    public function __construct($name)
    {
        parent::__construct($name);
        $this->health = 150;
    }
    public function pet()
    {
        $this->health += 5;
        return $this;
    }
}
class Dragon extends Animal
{
    public function __construct($name)
    {
        parent::__construct();
        $this->health = 170;
    }
    public function fly()
    {
        $this->health -= 10;
        return $this;
    }
}
$animal = new Animal("animal");
$animal->walk()->walk()->walk()->run()->run()->displayHealth();
echo "<br>";
$dog = new Dog("dog");
$dog->walk()->walk()->walk()->run()->run()->pet()->displayHealth();
$dragon = new Dragon("dragon");
$dragon;

        echo "Setting '{$name}' to '{$value}' <br/>";
        if (property_exists($this, $name)) {
            $this->{$name} = $value;
        } else {
            echo "property {$name} does NOT exist <br/>";
        }
    }
    public function __get($name)
    {
        echo "Getting '{$name}' <br/>";
        if (property_exists($this, $name)) {
            return $this->{$name};
        } else {
            echo "property {$name} does NOT exist <br/>";
        }
    }
}
$johny = new Dog("blue");
$rony = new Dog("Rony", "setter", "brown");
$johny->walk(15);
$johny->show_info();
$johny->eat("bones", 2);
$johny->show_info();
$rony->show_info();
$rony->color = "red";
echo $rony->color;
$totalEnergy = $johny->energy + $rony->energy;
if ($johny->energy > $rony->energy) {
    echo "johny wins";
}
echo $rony->legs;

class Dragon extends Animal
{
    public function __construct($name)
    {
        parent::__construct($name);
        $this->health = 170;
    }
    public function fly()
    {
        $this->health -= 10;
        echo 'fly, ';
        return $this;
    }
    public function displayHealth()
    {
        echo '<br /><strong>Dragon Message: </strong><em>This is a dragon!</em>';
        parent::displayHealth();
    }
}
echo '<h2>$animal Object Instance of the Animal Class with Various Invoked Methods</h2>';
$animal = new Animal("animal");
$animal->walk()->walk()->walk()->run()->run()->displayHealth();
echo '<h2>$black_lab Object Instance of the Dog Subclass (of the Animal Parent Class) with Various Invoked Methods</h2>';
$black_lab = new Dog("Bo");
$black_lab->walk()->walk()->walk()->run()->run()->pet()->displayHealth();
echo '<h2>$crazy_dragon Object Instance of the Dragon Subclass (of the Animal Parent Class) with Various Invoked Methods</h2>';
$crazy_dragon = new Dragon("Crazy Dragon");
$crazy_dragon->walk()->walk()->walk()->run()->run()->fly()->fly()->displayHealth();
echo '<h2>Calling the fly() and pet() Methods on the Animal Class Will Display an Error Message Per the Code Below</h2>';
$lizard = new Animal("Freddy");
$lizard->pet()->fly();

//---------------DOG CLASS------------------//
class Dog extends Animal
{
    public function __construct($name)
    {
        $this->name = $name;
        $this->hp = 150;
    }
    public function pet()
    {
        $this->hp += 5;
    }
}
//---------END OF DOG CLASS CODE-------------//
$dog1 = new Dog('bill');
$dog1->walk();
$dog1->walk();
$dog1->walk();
$dog1->run();
$dog1->run();
$dog1->pet();
$dog1->display_hp();
//-----DRAGON CLASS------------------------//
class Dragon extends Animal
{
    public function __construct($name)
    {
        $this->name = $name;
        $this->hp = 170;
    }
    public function fly()

    public function displayHealth()
    {
        echo "Name: {$this->name}\n";
        echo "Health: {$this->health}\n";
        echo "This is the dragon!\n";
    }
    public function fly()
    {
        $this->health = $this->health - 10;
        return $this;
    }
}
$anim1 = new Animal();
$anim1->walk()->walk()->walk()->run()->run()->displayHealth();
$anim2 = new Dog();
$anim2->walk()->walk()->walk()->run()->run()->pet()->displayHealth();
$anim3 = new Dragon();
$anim3->walk()->walk()->walk()->run()->run()->fly()->fly()->displayHealth();
/*
Now, create another class called Dog that inherits everything 
that the Animal does and have, but 1) have the default health
 by 150 and 2) add a new method called pet, which when invoked,
  increase the health by 5. Have the Dog walk three times, 
  run twice, petted once, and have it display its health.
*/
/*
Now, create another classed called Dragon that inherits 
everything that the Animal does and have, but 1) have the 
default health be 170 and 2) add a new method called fly, 
which when invoked, decreased the health by 10. Have the
 Dragon walk three times, run twice, fly twice, and have it