只保留关键字标签（description）与描述标签 （keywords）
先献上代码：
<?php $this->header('generator=&template=&pingback=&xmlrpc=&wlw=&atom=&rss1=&rss2='); ?>
请替换模版中<?php $this->header(); ?>，考虑SEO友好所以保留description及keywords如果其它有需求可以自行保留比如rss，一般都会在界面增加rss按钮一般可以为浏览器等工具提供探测。
基本用法：
keywords= (表示替换keywords标签内容，当"="后面没有内容则表示屏蔽调用，也就是删除)
& （处理多个时用到，如果有下一个需要屏蔽放下一个前面区隔开就可以了）
值解释：
内容描述/description：<meta name="description" content="以及乐，与快乐同行" />
关键字/keywords：<meta name="keywords" content="以及乐,子曰去哪" />
程序信息/generator：<meta name="generator" content="Typecho 0.9/13.12.12" />
模版名/template：<meta name="template" content="yijile" />
文章引用/pingback：<link rel="pingback" href="https://yijile.com/action/xmlrpc" />
离线写作接口/xmlrpc：<link rel="EditURI" type="application/rsd+xml" title="RSD" href="https://yijile.com/action/xmlrpc?rsd" />
离线写作接口/wlw：<link rel="wlwmanifest" type="application/wlwmanifest+xml" href="https://yijile.com/action/xmlrpc?wlw" />
Feed地址/rss2：<link rel="alternate" type="application/rss+xml" title="RSS 2.0" href="https://yijile.com/feed/" />
Feed地址rss旧版/rss1：
Feed atom（应该可以说是比rss2兼容性更好吧）/atom：
上面有提到当“=”后面没有内容就将值屏蔽了，如果“=”后面有内容就代替默认的
如：generator=Wordpress，那么前端调用后就是<meta name="generator" content="Wordpress" />
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