php static是什么意思

// ----类内部----
// 调用普通成员
this->name;
// 调用静态成员
self::name_static;
// ----类外部----
// 调用普通成员需要实例化使用
Car c = new Car();
c->name;
// 调用静态方法
c::fun()  <==>  Car::fun()
// 调用静态变量
Car::name;

class Car
{
    private $name;
    private static $type = "Car";
    function __construct($name)
    {
        $this->name = $name;
        echo "Car " . $name . " has created!\n";
    }
    public static function getType()
    {
        echo self::$type . "\n";
    }
    public function getName()
    {
        echo "Car name is " . $this->name . "\n";
    }
    function __destruct()
    {
        echo "Car " . $this->name . " has destory!";
    }
}

class  test extends PHPUnit_Framework_TestCase
{
    public function test_car()
    {
        $car = new Car("BMW");
        $car::getType();
        $car->getName();
    }
}

Car BMW has created!
Car
Car name is BMW
Car BMW has destory!