(PHP 5 >= 5.4.0, PHP 7) Create a filtered iterator from another iterator

(PHP 5 >= 5.5.0, PHP 7) Add/insert a new value at the specified index

(PHP 5 >= 5.3.0, PHP 7) Return current node index

(PHP 5 >= 5.3.0, PHP 7) Next element public

(PHP 5 >= 5.3.0, PHP 7) Constructs a new stack implemented using a doubly linked list

(PHP 5 >= 5.1.0, PHP 7) Portable file locking

(PHP 5, PHP 7) Determine if current DirectoryIterator item is a symbolic link

(PHP 5 >= 5.1.0, PHP 7) Forward to the next element

(PHP 5 >= 5.2.0, PHP 7) Sort the entries with a user-defined comparison function and maintain key association

(PHP 5 >= 5.3.0, PHP 7) Serialize public string