WordPress无插件自动实现tag关键字内链，抛弃wp-keyword-link

//tag自动内链

$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）

$match_num_to = 2; //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2次）

//连接到WordPress的模块

add_filter('the_content','tag_link',1);

//按长度排序

function tag_sort($a, $b){

	if ( $a->name == $b->name ) return 0;

	return ( strlen($a->name) > strlen($b->name) ) ? -1 : 1;

}

//改变标签关键字

function tag_link($content){

global $match_num_from,$match_num_to;

	 $posttags = get_the_tags();

	 if ($posttags) {

		 usort($posttags, "tag_sort");

		 foreach($posttags as $tag) {

			 $link = get_tag_link($tag->term_id);

			 $keyword = $tag->name;

			 //连接代码

			 $cleankeyword = stripslashes($keyword);

			 $url = "<a title="\"".str_replace('%s',addcslashes($cleankeyword," href="\"$link\"" target="_blank">".addcslashes($cleankeyword, '$')."</a>";

			 $limit = rand($match_num_from,$match_num_to);

			//不连接的代码

                         $content = preg_replace( '|(<a[^>]+>)(.*)('.$ex_word.')(.*)(]*>)|U'.$case, '$1$2%&&&&& %$4$5', $content);

			 $content = preg_replace( '|(<img)(.*?)('.$ex_word.')(.*?)(>)|U'.$case, '$1$2%&&&&& %$4$5', $content);

				$cleankeyword = preg_quote($cleankeyword,'\'');

					$regEx = '\'(?!((<.*?)|(<a.*?)))('. $cleankeyword . ')(?!(([^<>]*?)>)|([^>]*?))\'s' . $case;

				$content = preg_replace($regEx,$url,$content,$limit);

	$content = str_replace( '%&&&&& %', stripslashes($ex_word), $content);

		 }

	 }

    return $content;

}