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  // Determine the list of instances to iterate on.

  list(, , $bundle) = entity_extract_ids($entity_type, $entity);

  $instances = field_info_instances($entity_type, $bundle);

  // Iterate through the instances and collect results.

  foreach ($instances as $instance) {

    $field_name = $instance['field_name'];

    // If the instance is a price field with data...

      $commerce_price_fields[] = $field_name;

    }

  }

}

/**

 *

 * This hook is used to unserialize the price field's data array after it has

 * been updated, because the data array is serialized before it is saved and

  $value['amount'] = trim($value['amount']);

  $currency = commerce_currency_load($value['currency_code']);

    form_error($element, t('A numeric amount is required for setting and comparing against price field data.'));

  }