FieldStorageConfigStorage::loadByProperties

public FieldStorageConfigStorage::loadByProperties(array $conditions = array())

public function loadByProperties(array $conditions = array()) {
  // Include deleted fields if specified in the $conditions parameters.
  $include_deleted = isset($conditions['include_deleted']) ? $conditions['include_deleted'] : FALSE;
  unset($conditions['include_deleted']);

  /** @var \Drupal\field\FieldStorageConfigInterface[] $storages */
  $storages = array();

  // Get field storages living in configuration. If we are explicitly looking
  // for deleted storages only, this can be skipped, because they will be
  // retrieved from state below.
  if (empty($conditions['deleted'])) {
    if (isset($conditions['entity_type']) && isset($conditions['field_name'])) {
      // Optimize for the most frequent case where we do have a specific ID.
      $id = $conditions['entity_type'] . $conditions['field_name'];
      $storages = $this->loadMultiple(array($id));
    }
    else {
      // No specific ID, we need to examine all existing storages.
      $storages = $this->loadMultiple();
    }
  }

  // Merge deleted field storages (living in state) if needed.
  if ($include_deleted || !empty($conditions['deleted'])) {
    $deleted_storages = $this->state->get('field.storage.deleted') ? : array();
    foreach ($deleted_storages as $id => $config) {
      $storages[$id] = $this->create($config);
    }
  }

  // Collect matching fields.
  $matches = array();
  foreach ($storages as $field) {
    foreach ($conditions as $key => $value) {
      // Extract the actual value against which the condition is checked.
      $checked_value = $field->get($key);
      // Skip to the next field as soon as one condition does not match.
      if ($checked_value != $value) {
        continue 2;
      }
    }

    // When returning deleted fields, key the results by UUID since they can
    // include several fields with the same ID.
    $key = $include_deleted ? $field->uuid() : $field->id();
    $matches[$key] = $field;
  }

  return $matches;
}