<?php
class?glass{
	public?$name;
	public?$height;
	public?$weight;
	public?$color;


	public?static?$capacity;//定義靜態變量capacity?容量




	function?__construct($name,$height,$weight,$color,$capacity)
	//?問題1：構造函數前面是function，不是public


	{
		$this->name=$name;
		$this->height=$height;
		$this->weight=$weight;
		$this->color=$color;
		self::$capacity=$capacity;


		echo?$this->name."杯子的高度為"."$height"."\n"."$this->name"."杯子的顏色為"."$color"."\n"."$this->name"."杯子的容量為"."$capacity"."\n"."\n";
	}


	function?__destruct(){
		echo?"銷毀".$this->name."杯子"."\n";
	}


	public?static?function?ChangeCapacity($newcapacity){
		self::$capacity=$newcapacity;
		//?echo?"$this->name"."$newcapacity"."\n";
	}
}






$glass1=new?glass("num1","500mm","100mm","藍色","500ml");
//?$glass2=new?glass("num2","300mm","500mm","黑色","750ml");


//?$glass1->ChangeCapacity("900ml");




//問題2：修改靜態成員參數值的方法
//?應使用?	類名::成員參數("參數值")；
//輸出?		echo?類名::$成員參數;
glass::ChangeCapacity("123");
echo?glass::$capacity."\n";
$glass3=new?glass("num3","100mm","100mm","白色","520ml");
?>

在下面修改了glass類中capacity參數為123，但是后面再次實例化對象后，輸出的$capacity值仍為定義的"520ml"，而不是修改后的值：123