public StreamWrapperManager::getDescriptions($filter = StreamWrapperInterface::ALL)
Returns registered stream wrapper descriptions.
Parameters
int $filter: (Optional) Filters out all types except those with an on bit for each on bit in $filter. For example, if $filter is StreamWrapperInterface::WRITE_VISIBLE, which is equal to (StreamWrapperInterface::READ | StreamWrapperInterface::WRITE | StreamWrapperInterface::VISIBLE), then only stream wrappers with all three of these bits set are returned