http://php.net/manual/en/function.dns-get-record.php gives some simple examples of PHP code doing DNS lookups. Try one of these on your server.
If that works then the issue is Wordpress. If it does not return any result, then it really is the chrooted PHP install.
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You don't need to be a genius to debug a pf.conf firewall ruleset, you just need the guts to run tcpdump
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