(PHP 5 >= 5.0.0, PHP 7) Rewind array back to the start

(PHP 5 >= 5.2.0, PHP 7) Sort an array using a case insensitive "natural order" algorithm

(PHP 5 >= 5.3.0, PHP 7) Inserts an element in the heap by sifting it up.

(PHP 5, PHP 7) Get inode change time of the current DirectoryIterator item

(PHP 5 >= 5.3.0, PHP 7) Checks if an iterator is attached

(PHP 5 >= 5.1.0, PHP 7) Get the current key

(PHP 5 >= 5.1.0, PHP 7) Construct a new file object.

(PHP 5 >= 5.3.0, PHP 7) Moves all attached iterator instances forward

(PHP 5 >= 5.2.0, PHP 7) The offsetExists purpose

(PHP 5 >= 5.2.0, PHP 7) Get the delimiter and enclosure character for CSV