php类和对象之protected与const属性_PHP教程

class Date{
const M="Monday";
}
echo "today is ".Date::M;
?>

class me{
protected $Money =100;
protected $price1=60;

public function Sell($price){
if($this->price1<=$price){
echo "好，卖给你了。
";
$this->Money = $this->Money+$price;
return "我现在总共有 ".$this->Money." 元钱";
}
else{
echo "我不卖 ,$price 太便宜了
";
return "现在我还是 ".$this->Money." 元钱";
}
}
}

$now=new me;
echo $now->Sell(30);
?>