Add Missing Alt Tags To WordPress Images

Add Missing Alt Tags To WordPress Images

/**
* Add Missing Alt Tags To WordPress Images By http://goo.gl/ht6fZo
*/
function add_alt_tags($content)
{
        global $post;
        preg_match_all('//', $content, $images);
        if(!is_null($images))
        {
                foreach($images[1] as $index => $value)
                {
                        if(!preg_match('/alt=/', $value))
                        {
                                $new_img = str_replace('<img', '"'.$post-post_title.'"', $images[0][$index]);
                                $content = str_replace($images[0][$index], $new_img, $content);
                        }
                }
        }
        return $content;
}
add_filter('the_content', 'add_alt_tags', 99999);