<?php

/**
 * Update field instances which use tokens as default value.
 */
function field_default_token_update_7000() {
  $updated_fields = array();
  foreach (field_info_instances() as $entity_instances) {
    foreach ($entity_instances as $bundle_instances) {
      foreach ($bundle_instances as $field_name => $instance) {
        $has_tokens = FALSE;
        if (!empty($instance['default_value'])) {
          foreach ($instance['default_value'] as $values) {
            foreach ($values as $value) {
              if (!is_array($value)) {
                if (strpos($value, '[') !== FALSE) {
                  $has_tokens = TRUE;
                }
              }
              else {
                foreach ($value as $column_value) {
                  if (strpos($column_value, '[') !== FALSE) {
                    $has_tokens = TRUE;
                  }
                }
              }
            }
          }
        }
        if ($has_tokens) {
          field_update_instance($instance);
          $updated_fields[$field_name] = $field_name;
        }
      }
    }
  }
  if (!empty($updated_fields)) {
    return t('Updated fields: @fields.', array('@fields' => implode(', ', $updated_fields)));
  }
}