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From: Greg Wooledge <wooledg@eeg.ccf.org>
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Subject: Re: An array variable created by export/readonly builtins inside a function becomes a locale variable to that function unexpectedly
Date: Mon, 30 Nov 2015 08:29:09 -0500
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On Sat, Nov 28, 2015 at 11:18:24AM +0800, ziyunfei wrote:
> $ bash -c 'foo() { readonly a=(1);echo a=$a; }; foo; echo a=$a' # a becomes a local variable
> a=1
> a=

"readonly" is a synonym for "declare -r", and declare (without the -g
option) always marks variables as local when used in a function.

If you want variables created in a function NOT to be local to that
function, you must skip all declarations entirely.  Just create the
variable by assigning to it.