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foreach my $v1 (@array1)
  { my $v2= shift @array2;
    print $v1, $v2;
  }

# print all elements
while( @array1 || @array2)
  { my $v1= shift @array1 || "empty"; # or whatever default value
    my $v2= shift @array2 || "empty";
    print $v1, $v2;
  }

# print elements up to the shortest array length
while( @array1 && @array2)
  { my $v1= shift @array1;
    my $v2= shift @array2;
    print $v1, $v2;
  }