join() function is returning the type followed by a hex number instead of a concatenated string

Question

In essence, I want to take an array and create a single string with the elements of said array separated by a newline.

I have an array named $zones. Outputting the reference to $zones confirms it's an array.

The following code:

print_log(Dumper($zones));
print_log('-------');
print_log(Dumper(join("\n",$zones)));

results in the following output

  [2013-06-15 16:23:29 -0500] info [dnsadmin] $VAR1 = [
          'fake.com25',
          'fake.com2',
          'fake.com27',
          'fake.com43',
          'fake.com41',
          'fake.com40',
          'fake.com39',
          'fake.com37',
          'fake.com36',
          'fake.com35',
          'fake.com31',
          'fake.com56',
          'fake.com55',
          'fake.com54',
          'fake.com53',
          'fake.com52',
          'fake.com51',
          'fake.com50',
          'fake.com49',
          'fake.com48',
          'fake.com42',
          'fake.com38',
          'fake.com34',
          'fake.com33',
          'fake.com32',
          'fake.com30',
          'fake.com29',
          'fake.com28',
          'fake.com26',
          'fake.com24',
          'fake.com23',
          'fake.com69',
          'fake.com68',
          'fake.com67',
          'fake.com66',
          '0',
          'fake.com44',
          'fake.com45',
          'fake.com46',
          'fake.com278'
        ];

[2013-06-15 16:23:29 -0500] info [dnsadmin] -------
[2013-06-15 16:23:29 -0500] info [dnsadmin] $VAR1 = 'ARRAY(0x170cf0d8)';

I really don't want to loop over this array manually. Can someone explain why the join() function is returning the name of the type along with a hex number?