Helper function to get the default value for a field on an entity.
$entity_type: The type of $entity; e.g., 'node' or 'user'.
$entity: The entity for the operation.
$field: The field structure.
$instance: The instance structure.
$langcode: The field language to fill-in with the default value.
function field_get_default_value($entity_type, $entity, $field, $instance, $langcode = NULL) {
$items = array();
if (!empty($instance['default_value_function'])) {
$function = $instance['default_value_function'];
if (function_exists($function)) {
$items = $function($entity_type, $entity, $field, $instance, $langcode);
}
}
elseif (!empty($instance['default_value'])) {
$items = $instance['default_value'];
}
return $items;
}