PHP Vehicle::drive示例

    public function attack($person)
    {
        $person->health - 10;
    }
}
$frank = new Person('Frank');
echo $frank->speak();
echo "<br><br><br><br><br><br>";
class Vehicle
{
    public $fuelAmount;
    public $mpg;
    public function __construct($fuelAmount, $mpg)
    {
        $this->fuelAmount = $fuelAmount;
        $this->mpg = $mpg;
    }
    public function honk()
    {
        return "honk honk I have " . $this->fuelAmount . " gal of gas.";
    }
    public function drive($distance)
    {
        $this->fuelAmount -= $distance / $this->mpg;
    }
}
$mustang = new Vehicle(100, 50);
echo $mustang->honk();
$mustang->drive(500);
echo $mustang->honk();
echo "<br><br><br><br><br><br>";

示例#2

显示文件

文件： Class 7.php 项目： hwaunhwan/PHPIntermediate

 function drive(){
     parent::drive();
     $this->gas-= 5;
     echo "Now I have $this->gas percent of gas left.<br>";}