利用初始代码中所定义的Person类结构，完善类中的函数，并通过Person类设置并获取明明的身高体重。

<?php
class Person{
    private $name;
    private $weight;
    private $height;
    public function __construct($name, $weight, $height){
        $this->name=$name;
        $this->weight=$weight;
        $this->height=$height;
    }
    public function getName() {
        echo $this->name;
    }
    public function getWeight() {
        echo "体重是".$this->weight."kg。";
    }
    public function getHeight() {
        echo "身高是".$this->height."cm,";
    }
}
$person  = new Person('明明', '51.5', '165');
echo $person->getName();
echo '的';
echo $person->getHeight();
echo $person->getWeight();
?>