这代码什么意思，去哪里看它们的源代码？
php新手.. 老鸟多指教 ..
关于网上对apply_filters的说法：调用添加到过滤器hook上的函数。
实在是不明白过滤器hook在什么地方；
而且 comment_form_logged_in 是函数？ 是的话通常定义在什么地方，源代码在哪里？
还有 $args['logged_in_as'], $commenter, $user_identity 这三个是变量？但是在整个页面中没有声明，变量中有['logged_in_as']是什么东西？
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