将代码加入到当前主题的functions.php文件下

如：/wp-content/themes/jizhisucai/functions.php

适用：AT互联极致3.0版本

// WordPress 自动为文章添加已使用过的标签
function array2object($array) { // 数组转对象
if (is_array($array)) {
$obj = new StdClass();
foreach ($array as $key => $val){
$obj->$key = $val;
}
}
else {
$obj = $array;
}
return $obj;
}
function object2array($object) { // 对象转数组
if (is_object($object)) {
foreach ($object as $key => $value) {
$array[$key] = $value;
}
}
else {
$array = $object;
}
return $array;
}
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) {
$i = 0;
$arrs = object2array($tags);shuffle($arrs);$tags = array2object($arrs);// 打乱顺序
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, $tag->name) !== false){
if ($i == 5) { // 控制输出数量
break;
}
wp_set_post_tags( $post_id, $tag->name, true );
$i++;
}
}
}
}

适用：极致素材2.1模板+moban-child模板

/* 自动为文章内的标签添加内链 */
$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($cleankeyword, \'$\'),__(\'【查看更多[%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);