nevermind, I found the issue. The two spaces in my regex were the issue.
Hmm... Well, it is not causing any errors at all... hence my confusion. I'll give you the source, the issue, the intended result, and finally a link to the actual result.
1. The source:
$page = preg_replace('/(<img src=\") (.*?) (\")/eis',
"'<img src=\"image.php?r=' . urlencode('\\2') . '\"'",
$page);
$page = str_replace("\r", "", $page);
$page = str_replace("\n", "", $page);
$page = str_replace(" ", " ", $page);
$page = str_replace("> <", "><", $page);
$page = trim($page);
echo $page;
2. The issue: It's not replacing anything.
3. The intended result: It should take things like... <img src="images/dark.png" alt="" /> and turn them to <img src="image.php?r=urlencode(images/dark.png)" alt="" />...
4. The actual result: http://project-ddl.org/mpm/index.php