WordPress 网站必备：自动为文章外链添加 nofollow，提升网站安全与权重

function add_image_alt_title_tags($content) {
global $post;
$post_title = $post->post_title;
$pattern = '/<img(.*?)\/>/i';
preg_match_all($pattern, $content, $matches);
foreach ($matches[0] as $index => $img_tag) {
if (strpos($img_tag, ' alt=') === false || preg_match('/ alt=["\']\s*["\']/', $img_tag)) {
$replacement = preg_replace('/<img/', '<img alt="' . $post_title . ' ' . ($index + 1) . '" title="' . $post_title . ' ' . ($index + 1) . '"', $img_tag);
$content = str_replace($img_tag, $replacement, $content);
}
}
return $content;
}
add_filter('the_content', 'add_image_alt_title_tags');

//文章外链nofollow结束