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WordPress文章中为标签自动添加内部链接教程

将下面的代码添加至functions.php中,其中,$match_num_from$match_num_to分别表示一个标签在文章中出现少于多少次不添加链接和一篇文章中同一个标签添加几次链接:

//tag -> link
$match_num_from = 1;  // 一个标签在文章中出现少于多少次不添加链接
$match_num_to = 1; // 一篇文章中同一个标签添加几次链接
add_filter('the_content','tag_link',1);
//按长度排序
function tag_sort($a, $b){
    if ( $a->name == $b->name ) return 0;
    return ( strlen($a->name) > strlen($b->name) ) ? -1 : 1;
}
//为符合条件的标签添加链接
function tag_link($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;
            //链接的代码
            $cleankeyword = stripslashes($keyword);
            $url = "<a href=\"$link\" title=\"".str_replace('%s',addcslashes($cleankeyword, '$'),__('查看%s的所有文章'))."\"";
            $url .= ' target="_blank" style="color:#555; "';
            $url .= ">".addcslashes($cleankeyword, '$')."</a>";
            $limit = rand($match_num_from,$match_num_to);
            //不链接的代码
            $content = preg_replace( '|(<a[^>]+>)(.*)('.$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;
}

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