No, PhpDig does not need to be on the same server as the domain, but if your OS/setup is, for example, a CGI loadbalanced cluster of servers, it may not possible to index sites on the cluster as there cannot be a connection back to the loadbalanced address. Presumably not every site you've tried is on the same server, so it seems like some sort of setting issue but I'm not sure. Slap in a bunch of echo "A"; echo "B"; etcetera into spider.php and see what prints onscreen. Hopefully that will provide a clue.
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