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Sort order issue from query/json string in DB to xml

Posted on 2016-09-30
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Last Modified: 2016-09-30
Hi,
Having a big issue with sort order when retrieving images from DB and exporting as xml.
In the DB the images are saved in a longtext column like this:
["5.jpg","11.jpg","10.jpg","6.jpg","21.jpg","2.jpg","20.jpg","4.jpg","19.jpg","9.jpg","14.jpg","8.jpg","1.jpg","23.jpg","16.jpg","18.jpg","7.jpg","15.jpg","22.jpg","17.jpg","3.jpg","13.jpg","12.jpg"]

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When I run the query I am getting that sort order, but need them sequentially.

I'm attempting it by doing this:
// Process image url loop
$pics = json_decode($row->images);
natsort($pics);

$px = count($pics);
$feed->startElement('Images');
for($i=0; $i<$px; $i++)
{
$feed->startElement('Image');
$feed->writeElement('FileURL', url() . '/media/used_vehicles/' . $row->id . '/full/'. $pics[$i]);
$feed->endElement(); // End Image										
}
$feed->endElement(); // End Images

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but my sort order is unchanged in the resulting xml

Any ideas?
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Question by:tjyoung
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5 Comments
 
LVL 23

Expert Comment

by:Ferruccio Accalai
ID: 41823465
That's beacuse natsort ( and also natcasesort) mantains the idx/value relationship so if you use that idx like $pics[$i] you'll have back the original indexed value
(try a print_r to understand it)

You should loop into the sorted $pics using a foreach routine

foreach ($pics as $thispic)
{
  $feed->startElement('Image');
  $feed->writeElement('FileURL', url() . '/media/used_vehicles/' . $row->id . '/full/'. $thispic);
  $feed->endElement(); // End Image	 
} 

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0
 
LVL 1

Author Comment

by:tjyoung
ID: 41823495
HI,
Thanks for the info. I tried running that but it didn't sort as hoped.
This is my adjustment in case I missed something:

// Process image url loop
$pics = json_decode($row->images);
								
$feed->startElement('Images');
foreach ($pics as $thispic)
{
  $feed->startElement('Image');
  $feed->writeElement('FileURL', url() . '/media/used_vehicles/' . $row->id . '/full/'. $thispic);
  $feed->endElement(); // End Image	 
}
$feed->endElement(); // End Images
								

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0
 
LVL 23

Accepted Solution

by:
Ferruccio Accalai earned 2000 total points
ID: 41823511
You still have to call natsort, and then use foreach
// Process image url loop
$pics = json_decode($row->images);
// now sort by natsort
natsort($pics);
								
$feed->startElement('Images');
foreach ($pics as $thispic)
{
  $feed->startElement('Image');
  $feed->writeElement('FileURL', url() . '/media/used_vehicles/' . $row->id . '/full/'. $thispic);
  $feed->endElement(); // End Image	 
}
$feed->endElement(); // End Images

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0
 
LVL 1

Author Closing Comment

by:tjyoung
ID: 41823545
Thats awesome. Sorry I wondered if I needed that after the fact.
Really appreciate you taking the time. Saved me much pain :)
0
 
LVL 23

Expert Comment

by:Ferruccio Accalai
ID: 41823554
Glad to have helped you ;)
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