入门php需要注意的点

weight=100;
			$this->height=100;
		}
		public function addWeight($a)
		{
			$this->weight+=$a;
		}
		
	}
	$pig=new Pig();
	$pig->addWeight(10);
	echo $pig->weight."||".$pig->height;



?>

隐藏效果的实现：通过 id 控制

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