WordPress 文章如何自动增加关键词为内链【非插件】

//WordPress 文章关键词自动内链

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){

$match_num_from = 1; //一个标签少于几次不链接

$match_num_to = 1; //一个标签最多链接几次

$posttags = get_the_tags();

if ($posttags) {

usort($posttags, "tag_sort");

foreach($posttags as $tag) {

$link = get_tag_link($tag->term_id);

$keyword = $tag->name;

//链接代码

$cleankeyword = stripslashes($keyword);

$url = "<a href="\&quot;$link\&quot;" title="\&quot;&quot;.str_replace('%s',addcslashes($cleankeyword," '$'),__('更多关于="" %s="" 的文章'))."\"";="" $url="" .=" target=&quot;_blank&quot;" ;="" .addcslashes($cleankeyword,="" '$')."<="" a="">";

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

//不链接代码

$content = preg_replace( '|(<a[^>]+&gt;)(.*)<pre.*?>('.$ex_word.')(.*)&lt;\/pre&gt;(</pre.*?></a[^>]*&gt;)|U'.$case, '$1$2%&amp;&amp;&amp;&amp;&amp;%$4$5', $content);

$content = preg_replace( '|(<img)(.*?)('.$ex_word.')(.*?)(>)|U'.$case, '$1$2%&amp;&amp;&amp;&amp;&amp;%$4$5', $content);

$cleankeyword = preg_quote($cleankeyword,'\'');

$regEx = '\'(?!((&lt;.*?)|(<a.*?)))('. $cleankeyword="" .="" ')(?!(([^<="">]*?)&gt;)|([^&gt;]*?</a.*?)))('.></img)(.*?)('.$ex_word.')(.*?)(></a>))\'s' . $case;

$content = preg_replace($regEx,$url,$content,$limit);

$content = str_replace( '%&amp;&amp;&amp;&amp;&amp;%', stripslashes($ex_word), $content);

}

}

return $content;

}

add_filter('the_content','tag_link',1);