How to block all URLs in robots.txt except for the directory indexes?

Question

For example, I want to block /foo.php, /foo/foo.php and every other similar URL in robots.txt, only leaving /, /foo/, etc. behind.

In other words, I want to block everything except the directories.

How is this possible?

Answer 1

If all URLs you want to block end in (or contain) .php, you could use

User-agent: *
Disallow: /*.php

However, this uses the * wildcard, which maybe not all parsers support (Google supports it).