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自定义函数这样中的形参怎么理解

WBOY
WBOYOriginal
2016-06-13 12:31:061128browse

自定义函数这样中的形参如何理解
下面是某个类中的一段代码

static function start(PDO $pdo){<br />
			self::init($pdo);<br />
			session_set_save_handler(<br />
					array(__CLASS__,"open"),<br />
					array(__CLASS__,"close"),<br />
					array(__CLASS__,"read"),<br />
					array(__CLASS__,"write"),<br />
					array(__CLASS__,"destroy"),<br />
					array(__CLASS__,"gc")<br />
				);<br />
<br />
			session_start();<br />
		}

该 函数中的PDO 做为形参,对此很疑惑,因为我理解函数的作用就是传参,返回传递回来的值的结果,而这种字符串如何传呢

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