[DOC]
# Class FilesystemIterator was introduced to have a better DirectoryIterator
# without having to change DirectoryIterator or RecursiveDirectoryIterator.
# On top of FilterIterator the new GlobIterator was introduced. This one allows
# to implement Countable(). But a glob stream flattens all structure, so it
# cannot be derived from RedursiveIterator. With the new structure all children
# of FilesystemIterator have nearly the same behavior. Just their capabilities
# are a bit different. Check out new inheritance tree on SplFileInfo:
#
# [marcus@frodo PHP_5_3]$ php ext/spl/examples/class_tree.php SplFileInfo
# make: `sapi/cli/php' is up to date.
# SplFileInfo
# |-DirectoryIterator (Iterator)
# | \-FilesystemIterator
# | |-GlobIterator (Countable)
# | \-RecursiveDirectoryIterator (RecursiveIterator)
# | \-Phar (ArrayAccess, Countable)
# |-PharFileInfo
# \-SplFileObject (RecursiveIterator, SeekableIterator)
# \-SplTempFileObject
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