function strip_all_tags($content)
{
$content = preg_replace(‘/\n/’,’ ‘,$content);
$content = preg_replace(‘/<script.*<\/script>/U’,’ ‘,$content);
$content = preg_replace(‘/<style.*<\/style>/U’,’ ‘,$content);
$content = strip_tags(strtolower($content));
return $content;
}

The function will remove all line breaks so strip_tags will not have problems with finding all markups.  Since strip_tags does not remove <style> tags, the new function will remove them using regex.