WordPress文章自动添加标签链接变为内链

wordPress/ target=_blank class=infotextkey>WordPress有一个缺点，它不能自动智能地添加标签。那么下面介绍的功能是自动添加标签和内部链的功能代码。只需要将代码复制到主题functions.php文件中，这个功能就可以实现了。

主题functions.php文件添加如下代码：

/* 自动为文章内的标签添加内链开始 */
$match_num_from = 1; //一篇文章中同一个标签少于几次不自动链接
$match_num_to = 1; //一篇文章中同一个标签最多自动链接几次
function tag_sort($a, $b){
 if ( $a->name == $b->name ) return 0;
 return ( strlen($a->name) > strlen($b->name) ) ? -1 : 1;
}
function tag_link($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;
 $cleankeyword = stripslashes($keyword);
 $url = "<a href="$link" title="".str_replace('%s',addcslashes($cleankeyword, '$'),__('【查看含有[%s]标签的文章】')).""";
 $url .= ' target="_blank"';
 $url .= ">".addcslashes($cleankeyword, '$')."</a>";
 $limit = rand($match_num_from,$match_num_to);
 $content = preg_replace( '|(<a[^>]+>)(.*)('.$ex_word.')(.*)(</a[^>]*>)|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 . ')(?!(([^<>]*?)>)|([^>]*?</a>))'s' . $case;
 $content = preg_replace($regEx,$url,$content,$limit);
 $content = str_replace( '%&&&&&%', stripslashes($ex_word), $content);
 }
 }
 return $content;
}
add_filter('the_content','tag_link',1);
/* 自动为文章内的标签添加内链结束 */