Image rotation question

applejack · **Posted:** Wed Aug 08, 2012 4:24 pm

I have a query which I am trying to see if anyone has an idea (better / different to mine) for rotating the display of an image.

1. Specific folder contains a number of images i.e. 1.jpg, 2.jpg, 3.jpg etc etc
2. The client wants the site to show the first image for say 5 days and after which show the second image etc etc
3. If all the images have been shown in order the loops starts again from the beginning.
4. The client also wants to be able to change the rotation frequency via the admin such as a global content block.
5. Can't use cookies.

My idea
1. Store the rotation frequency period in a GCB.
2. Write a UDT which check the modified date of the GCB against the number entered for the frequency.
3. If the modified date is greater than the number of days of the rotation then read from the folder the filenames against which to check whether or not the next image exists and if not start again.
4. The UDT would have to write to / update another GCB the number of the last image used and check against that.

Thanks in advance.

Dr.CSS · **Posted:** Wed Aug 08, 2012 6:36 pm

Make a {content block='rotateimage' label='For rotating images only'} then they can come back every 5 days, or whenever they want, and change the image...

applejack · **Posted:** Wed Aug 08, 2012 9:44 pm

Sure but they want it automated...

calguy1000 · **Posted:** Wed Aug 08, 2012 10:58 pm

I would do a udt something like this (untested)

Code:

  $config = cmsms()->GetConfig();
  $files = glob($config['uploads_path'].'/images/foo/img*.jpg');
  $n_images = count(files);
  $week = date('W');
  echo $config['uploads_url'].'/images/foo/img'.($weeknumber % $num_images).'.jpg';

Make sure the images to be rotated are in their own subdirectory... this code should rotate the images every 7 days.

applejack · **Posted:** Wed Aug 08, 2012 11:45 pm

Thanks Robert but that would make it random so will probably suggest that they just upload 52 images even if they have to repeat after a certain number and use something like

Code:

$week = date('W');
echo 'uploads/images/foo/img'.$week.'.jpg';

calguy1000 · **Posted:** Wed Aug 08, 2012 11:48 pm

actually, don't think so.. it'd rotate sequentially through all of the images... changing once per week.

applejack · **Posted:** Thu Aug 09, 2012 12:25 am

Re: ($weeknumber % $num_images)

I thought the % sign is the modulus operator
i.e. 9 / 2 remainder 1

calguy1000 · **Posted:** Thu Aug 09, 2012 12:41 am

okay... but if you had say 8 images:

week 9 % 8 = 1
week 10 % 8 = 2
week 11 % 8 = 3
week 12 % 8 = 4
week 13 % 8 = 5
week 14 % 8 = 6
week 15 % 8 = 7
week 16 % 8 = 0

get it.

applejack · **Posted:** Thu Aug 09, 2012 12:14 pm

Yes sequential not random, thanks for clarifying.

Image rotation question

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