wordpress 自动为文章增加标签,且自动为文章中标签关键词增加链接

代码都放在functions.php文件中

1.自动为文章增加标签:

[cce_xml]
 /* 自动为文章添加标签 */
    add_action('save_post', 'auto_add_tags');
    function auto_add_tags(){
        $tags = get_tags( array('hide_empty' => false) );
        $post_id = get_the_ID();
        $post_content = get_post($post_id)->post_content;
        if ($tags) {
            foreach ( $tags as $tag ) {
                // 如果文章内容出现了已使用过的标签,自动添加这些标签
                if ( strpos($post_content, $tag->name) !== false)
                    wp_set_post_tags( $post_id, $tag->name, true );
            }
        }
    }
[/cce_xml]

2.自动为文章中标签名增加链接:

[cce_xml]
/**
* WordPress 自动为文章标签添加该标签的链接
*/
$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($cleankeyword, '$'),__('View all posts in %s'))."\"";
$url .= ' target="_blank"';
$url .= ">".addcslashes($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;
}



[/cce_xml]