converting an array into a single variable

[Natan Shar]

Here's what I am trying to do:

I have a directory full of files. They are all image files and are numbered
using an id number, and underscore, and a detail number. Example:

for item 123456, there may be from 0 to 25 images with names such as
'123456_0.JPG' or '123456_47.JPG'

I need to collect the names of these files and then convert it into one
variable that I can then write into a database. My ideal example for the
above would be'123456_0.JPG,123456_47.JPG'

I can do this with a few id numbers using php, but I need to do this with
thousands of id numbers on a daily basis using a cron job

I can successully build an array of the filenames using:
declare -a imagelist='ls www/images/124534_*.JPG';

But then I am stuck with the problem of srtipping the 'www/images/' off of
each array element. I am trying:
 for file in ${imagelist[@]}
  do
  declare newfile=echo $file | sed 's/www\/images\///g'
  echo $newfile
  done;

But it is not working properly. Any ideas? Once this step is figured out,
how do I go about adding the filenames together, delimited with a comma? Any
nudging int eh right direction would be appreciated!
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