The constants below are defined by this extension, and
will only be available when the extension has either
been compiled into PHP or dynamically loaded at runtime.
eio_readdir() flag. If specified, the result argument of the callback
becomes an array with the following keys:
'names' - array of directory names
'dents' - array of struct eio_dirent-like
arrays having the following keys each:
'name' - the directory name;
'type' - one of EIO_DT_*
constants;
'inode' - the inode number, if available, otherwise
unspecified.
When this flag is specified, then the names will be returned in an order
suitable for stat'ing each one. When planning to
stat() all files in the given directory, the
returned order will likely be
fastest.