WordPress纯代码实现给文章关键词自动添加内链接

文章页面的关键词自动添加内链，有利于SEO，方便读者查看所有相关关键词的所有文章。建议最多替换3个重复的词！避免过度SEO适得其反。

修改教程:

打开 functions.php 文件，添加下列代码：

/*

*Wordpress文章关键词自动添加内链链接代码

*https://www.guoguochuan.com/

*/

//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;

}