WordPress文章关键词自动添加链接

/*

*自动为文章内的标签添加内链开始

*/

//连接数量

	$match_num_from = 1; //一个关键字少于多少不替换

	$match_num_to = 1; //一个关键字最多替换次数

	//连接到WordPress的模块

	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;

	}

	//改变标签关键字

	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;

	//连接代码

	$cleankeyword = stripslashes($keyword);

	$url = "<a href=\"$link\" title=\"".str_replace('%s',addcslashes($cleankeyword, '$'),__('查看所有文章关于 %s'))."\"";

	$url .= 'target="_blank"';

	$url .= ">".addcslashes($cleankeyword, '$')."</a>";

	$limit = rand($match_num_from,$match_num_to);

	//不连接的代码

	$content = preg_replace( '|(<a[^>]+>)(.*)('.$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;	

	}