This question describes how to set the value of a term reference field using PHP. But what do I do if I want to set the value of a term reference field in the user profile to multiple terms?

I am trying to set the value to term IDs 27 and 28. Here is my code so far:

$user->field_yourfield_name[LANGUAGE_NONE][0]['tid'] = 27;

Assuming the field is set up to accept multiple records...

$user->field_yourfield_name[LANGUAGE_NONE][0]['tid'] = 27;
$user->field_yourfield_name[LANGUAGE_NONE][1]['tid'] = 28;
// etc

Or you can just keep appending to the array (without knowing the next available index) like this:

$user->field_yourfield_name[LANGUAGE_NONE][]['tid'] = 27;
$user->field_yourfield_name[LANGUAGE_NONE][]['tid'] = 28;
| improve this answer | |

You can assign to a list value that contains entity metadata wrapper. For example:

  $wrapper = entity_metadata_wrapper('user', $user);
  foreach ($wrapper->field_taxonomy_terms->getIterator() as $delta => $term_wrapper) {
    // $term_wrapper may now be accessed as a taxonomy term wrapper.
    $label = $term_wrapper->name->value();
    $tid = $term_wrapper->tid->value();
    // you can also set the values
    $term_wrapper->name = 'New label';
    $term_wrapper->tid = array(123, 1234); // or ...
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