wordpress代码实现自动为文章添加关键词标签，发布文章时自动生成标签
将以下代码添加到functions.php文件内即可
// 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++;}}}}/* 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);
