dir_closedir ( )
dir_opendir ( $path, $options )
dir_readdir ( )
dir_rewinddir ( )
stream_close ( )
stream_eof ( )
stream_flush ( )
stream_open ( $path, $mode, $options, $opened_path )
stream_read ( $bytes )
stream_seek ( $offset, $whence )
stream_stat ( )
stream_tell ( )
stream_write ( $data )
url_stat ( $path, $flags )