Removing duplicates from generated multi-select dropdown list

Hi Terry,

Without seeing your code, its difficult to give a specific example, but it looks like you're going through your records one at a time to add options to your drop down.  Is that right?  If so, I think the best approach would be to gather up all the options into a single array and then use the PHP function array_unique() to get rid of any duplicates.

In this example, it's assuming that you have a field called "list" and that you want to collect up the "values" of that list into your dropdown.

$dropDownValues = array();
  
  foreach ($records as $record) {
    $dropDownValues = array_merge($dropDownValues, $record['list:values']);
  }
  
$dropDownValues = array_unique($dropDownValues);

At the end of this code, $dropDownValues will be an array of all of the list values from your records, with duplicates removed.

Hope this helps get you started

Dear Jason,

You are absolutely brilliant! This has removed duplicates from my drop-down box.

Thanks

Terry