Dumper takes a list of scalars for input. If you want to dump a hash, you need to pass a reference to the hash. 
print Dumper(%hash);   # Dumps the result of evaluating the hash. Meh.
print Dumper(\%hash);  # Dumps the ref and the referenced hash. Good.

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On the other hand, $po is a scalar. No need to pass a reference to it. 

print Dumper(\$po);  # Why??
print Dumper($po);   # Good.

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In reply to Re^3: Hash assignment "odd" ness by ikegami
in thread Hash assignment "odd" ness by phigment

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