function _field_invoke_multiple in Drupal 7

Invoke a field hook across fields on multiple entities.

Parameters

$op: Possible operations include:

load
prepare_view

For all other operations, use _field_invoke() / field_invoke_default() instead.

$entity_type: The type of $entity; e.g. 'node' or 'user'.

$entities: An array of entities, keyed by entity id.

$a:

The $age parameter in the 'load' operation.
Otherwise NULL.

$b: Currently always NULL.

$options: An associative array of additional options, with the following keys:

'field_name': The name of the field whose operation should be invoked. By default, the operation is invoked on all the fields in the entity's bundle. NOTE: This option is not compatible with the 'deleted' option; the 'field_id' option should be used instead.
'field_id': The id of the field whose operation should be invoked. By default, the operation is invoked on all the fields in the entity's' bundles.
'default': A boolean value, specifying which implementation of the operation should be invoked.
- if FALSE (default), the field types implementation of the operation will be invoked (hook_field_[op])
- If TRUE, the default field implementation of the field operation will be invoked (field_default_[op])
Internal use only. Do not explicitely set to TRUE, but use _field_invoke_multiple_default() instead.
'deleted': If TRUE, the function will operate on deleted fields as well as non-deleted fields. If unset or FALSE, only non-deleted fields are operated on.
'language': A language code or an array of arrays of language codes keyed by entity id and field name. It will be used to narrow down to a single value the available languages to act on.

Return value

An array of returned values keyed by entity id.

File

modules/field/field.attach.inc, line 278: Field attach API, allowing entities (nodes, users, ...) to be 'fieldable'.

Code

function _field_invoke_multiple($op, $entity_type, $entities, &$a = NULL, &$b = NULL, $options = array()) {

  // Merge default options.
  $default_options = array(
    'default' => FALSE,
    'deleted' => FALSE,
    'language' => NULL,
  );
  $options += $default_options;
  $fields = array();
  $grouped_instances = array();
  $grouped_entities = array();
  $grouped_items = array();
  $return = array();

  // Go through the entities and collect the fields on which the hook should be
  // invoked.
  //
  // We group fields by id, not by name, because this function can operate on
  // deleted fields which may have non-unique names. However, entities can only
  // contain data for a single field for each name, even if that field
  // is deleted, so we reference field data via the
  // $entity->$field_name property.
  foreach ($entities as $entity) {

    // Determine the list of instances to iterate on.
    list($id, $vid, $bundle) = entity_extract_ids($entity_type, $entity);
    $instances = _field_invoke_get_instances($entity_type, $bundle, $options);
    foreach ($instances as $instance) {
      $field_id = $instance['field_id'];
      $field_name = $instance['field_name'];
      $field = field_info_field_by_id($field_id);
      $function = $options['default'] ? 'field_default_' . $op : $field['module'] . '_field_' . $op;
      if (function_exists($function)) {

        // Add the field to the list of fields to invoke the hook on.
        if (!isset($fields[$field_id])) {
          $fields[$field_id] = $field;
        }

        // Extract the field values into a separate variable, easily accessed
        // by hook implementations.
        // Unless a language suggestion is provided we iterate on all the
        // available languages.
        $available_languages = field_available_languages($entity_type, $field);
        $language = is_array($options['language']) && !empty($options['language'][$id]) ? $options['language'][$id] : $options['language'];
        $languages = _field_language_suggestion($available_languages, $language, $field_name);
        foreach ($languages as $langcode) {
          $grouped_items[$field_id][$langcode][$id] = isset($entity->{$field_name}[$langcode]) ? $entity->{$field_name}[$langcode] : array();

          // Group the instances and entities corresponding to the current
          // field.
          $grouped_instances[$field_id][$langcode][$id] = $instance;
          $grouped_entities[$field_id][$langcode][$id] = $entities[$id];
        }
      }
    }

    // Initialize the return value for each entity.
    $return[$id] = array();
  }

  // For each field, invoke the field hook and collect results.
  foreach ($fields as $field_id => $field) {
    $field_name = $field['field_name'];
    $function = $options['default'] ? 'field_default_' . $op : $field['module'] . '_field_' . $op;

    // Iterate over all the field translations.
    foreach ($grouped_items[$field_id] as $langcode => &$items) {
      $entities = $grouped_entities[$field_id][$langcode];
      $instances = $grouped_instances[$field_id][$langcode];
      $results = $function($entity_type, $entities, $field, $instances, $langcode, $items, $a, $b);
      if (isset($results)) {

        // Collect results by entity.
        // For hooks with array results, we merge results together.
        // For hooks with scalar results, we collect results in an array.
        foreach ($results as $id => $result) {
          if (is_array($result)) {
            $return[$id] = array_merge($return[$id], $result);
          }
          else {
            $return[$id][] = $result;
          }
        }
      }
    }

    // Populate field values back in the entities, but avoid replacing missing
    // fields with an empty array (those are not equivalent on update).
    foreach ($grouped_entities[$field_id] as $langcode => $entities) {
      foreach ($entities as $id => $entity) {
        if ($grouped_items[$field_id][$langcode][$id] !== array() || isset($entity->{$field_name}[$langcode])) {
          $entity->{$field_name}[$langcode] = $grouped_items[$field_id][$langcode][$id];
        }
      }
    }
  }
  return $return;
}

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function _field_invoke_multiple in Drupal 7

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