(PHP 5 >= 5.1.0, PHP 7) Parses input from file according to a format

(PHP 5 >= 5.1.0, PHP 7) Rewinds the Iterator

(PHP 5 >= 5.3.0, PHP 7) Gets the flag information

(PHP 5, PHP 7) Move the iterator forward public

(PHP 5 >= 5.1.0, PHP 7) Check whether the inner iterator's current element has children

(PHP 5 >= 5.1.0, PHP 7) Get the inner iterator

(PHP 5 >= 5.2.0, PHP 7) Sets the regular expression flags.

(PHP 5, PHP 7) Access the current key public

(PHP 5 >= 5.1.0, PHP 7) Returns an iterator for the current entry.

(PHP 5 >= 5.1.0, PHP 7) Rewind the iterator to the first storage element