function image_seo($content){global $post;preg_match_all('/<img (.*?)/>/', $content, $images);if(!is_null($images)) {foreach($images[1] as $index => $value){if(!preg_match('/alt=/', $value)){$new_img = str_replace('<img', '<img alt="'.get_the_title().'"', $images[0][$index]);$content = str_replace($images[0][$index], $new_img, $content);}}}return $content;}add_filter('the_content', 'image_seo', 70000);