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静态方法调用等价于new对象吗

WBOY
Release： 2016-06-23 13:35:27
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看别人写的一个例子,似乎使用了静态调用后,就等价于new了一个对象了,不过从道理上怎么也没有理解
这到底是为什么呢


回复讨论(解决方案)

getDB里面实现了new 实例，返回的就是一个实例，所以就能用query()
静态方法是常驻内存的，调用要快一点，但是里面不能用 $this ，因为只有 new 实例以后才能用 $this

DB::getDB() 返回了一个 DB 的实例
你看看 getDB 方法的定义就清楚了

DB::getDB()
等价 
$db = new DB();
$db->getDB();

具体要看如何定义方法

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静态方法调用等价于new对象吗
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