Working with multiple values

This example shows how to set and display multiple values for a computed field.

Enable the multiple values option for the computed field.

In earlier version of Drupal (5? 7?)

Computed Code

$node_field[0]['value'] = "en.wikipedia.org/wiki/Scrapheap_Challenge";
$node_field[1]['value'] = "abc.net.au";
$node_field[2]['value'] = "australia.gov";

Enable the 'display this field' option for the computed field.

Display Format

$display = l('A link to '.$node_field_item['value'],'http://'.$node_field_item['value']);

When computed field executes the output will be displayed as:
A link to en.wikipedia.org/wiki/Scrapheap_Challenge
A link to abc.net.au
A link to australia.gov

In Drupal 8

In Drupal 8, to populate a multi-valued field, a single value must still be returned, but your function will be called multiple times for each of your values (or "deltas"). So it's necessary to populate the full delta-keyed array, but then only return the value requested (for each delta).

Computed Code

Here is an example.

function computed_field_FIELD_NAME_compute($entity_type_manager, $entity, $fields, $delta) {
  // Fill in array values with data.  The keys are optional in this case as they are the defaults.
  $values = [
    0 => 'Dog',
    1 => 'Cat',
    2 => 'Mouse',
  ];

  // Return the single value currently requested by the system.
  return $values[$delta];
}