WordPress自动将当前文章标签添加为关键词内链

//WordPress 文章标签自动内链
add_filter('the_content', 'fanly_auto_tags_link');
function fanly_auto_tags_link($content) {
	$tags = get_the_tags(); //获取当前文章的标签
	if($tags){
		foreach ($tags as $tag) {
			$link = get_tag_link($tag->term_id); //生成标签链接
			$tag_name = preg_quote($tag->name, '/'); //转义标签名
			//提前保护<a>、<img>、<code>标签内的内容
			$content = preg_replace_callback('/(<a[^>]*>)(.*?)(</a>)/si', function($matches) use ($tag_name) {
				return str_replace($tag_name, '%&&&&&%', $matches[0]);
			}, $content);
			$content = preg_replace_callback('/(<img[^>]*)(.*?)(' . $tag_name . ')(.*?)(>)/si', function($matches) use ($tag_name) {
				return str_replace($tag_name, '%&&&&&%', $matches[0]);
			}, $content);
			$content = preg_replace_callback('/(<code[^>]*>)(.*?)(</code>)/si', function($matches) use ($tag_name) {
				return str_replace($tag_name, '%&&&&&%', $matches[0]);
			}, $content);
			//替换内容中的标签文本为链接，限制替换次数为 1
			$content = preg_replace('/' . $tag_name . '/iu', '<a href="' . $link . '">' . $tag->name . '</a>', $content, 1);
			//恢复被保护的标签内的内容
			$content = str_replace('%&&&&&%', $tag_name, $content);
		}
	}
	return $content;
}