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这代码什么意思,往哪里看它们的源代码

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Release: 2016-06-13 12:46:08
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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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