$entry->{'attrs'}{'idcreatedon'}[0]
 $entry->{'attrs'}{'friendlyid'} [0]

##</code><code>##

print $entry->get_value("idcreatedon")."\n";
print $entry->get_value("friendlyid")."\n"; 
# The hash index is case-sensitive, and "get_value" documentation demands 'exact match'