Description
php_stream_dirent * 
php_stream_readdir ( php_stream * dirstream, php_stream_dirent * ent )
     php_stream_readdir() reads the next directory entry
     from dirstream and stores it into ent.
     If the function succeeds, the return value is ent.
     If the function fails, the return value is NULL.
     See php_stream_dirent for more
     details about the information returned for each directory entry.