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代码中的$form各表示什么,该如何解决

WBOY
WBOYOriginal
2016-06-13 11:41:37790browse

代码中的$form各表示什么
下面这段代码中的$form一会声明这个一会又赋值那个，实在是乱七八糟，不知这些在逻辑上怎么顺承的？

function __toString(){<br />			$form='<form action="'.$this->action.'" method="post" >';<br />			<br />			switch($this->shape){<br />				case "rect":<br />					$form.=$this->getRect();<br />					break;<br />				case "triangle":<br />					$form.=$this->getTriangle();<br />					break;<br /><br />				case "circle":<br />					$form.=$this->getCircle();<br />					break;<br /><br />				default:<br />					$form.='请选择一个形状<br>';<br />			}<br />			$form.='<input type="submit" name="sub" value="计算">';<br />			$form.='</form>';<br />			return $form;<br />		}

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