怎么给文章关键词自动添加内链链接？ - WordPress 教程

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/*
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*Wordpress文章关键词自动添加内链链接代码
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*https://www.npc.ink/15286.html
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*/
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//连接数量
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 $match_num_from = 1; //一篇文章中同一个关键字少于多少不锚文本（这个直接填1就好了）
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 $match_num_to = 1; //一篇文章中同一个关键字最多出现多少次锚文本（建议不超过1次）
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 //连接到WordPress的模块
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 add_filter('the_content','tag_link',1);
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 //按长度排序
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 function tag_sort($a, $b){
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 if ( $a->name == $b->name ) return 0;
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 return ( strlen($a->name) > strlen($b->name) ) ? -1 : 1;
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 }
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 //改变标签关键字
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 function tag_link($content){
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 global $match_num_from,$match_num_to;
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 $posttags = get_the_tags();
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 if ($posttags) {
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 usort($posttags, "tag_sort");
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 foreach($posttags as $tag) {
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 $link = get_tag_link($tag->term_id);
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 $keyword = $tag->name;
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 //连接代码
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 $cleankeyword = stripslashes($keyword);
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 $url = "<a href=\"$link\" title=\"".str_replace('%s',addcslashes($cleankeyword, '$'),__('查看所有文章关于 %s'))."\"";
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 $url .= 'target="_blank"';
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 $url .= ">".addcslashes($cleankeyword, '$')."</a>";
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 $limit = rand($match_num_from,$match_num_to);
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 //不连接的代码
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 $content = preg_replace( '|(<a[^>]+>)(.*)('.$ex_word.')(.*)(</a[^>]*>)|U'.$case, '$1$2%&&&&&%$4$5', $content);
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 $content = preg_replace( '|(<img)(.*?)('.$ex_word.')(.*?)(>)|U'.$case, '$1$2%&&&&&%$4$5', $content);
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 $cleankeyword = preg_quote($cleankeyword,'\'');
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 $regEx = '\'(?!((<.*?)|(<a.*?)))('. $cleankeyword . ')(?!(([^<>]*?)>)|([^>]*?</a>))\'s' . $case;
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 $content = preg_replace($regEx,$url,$content,$limit);
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 $content = str_replace( '%&&&&&%', stripslashes($ex_word), $content);
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 }
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 }
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 return $content;
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 }