(PHP 4, PHP 5, PHP 7) Returns a parent directory's path

(PHP 5 >= 5.1.0, PHP 7) Format line as CSV and write to file pointer

(PHP 4 >= 4.3.0, PHP 5, PHP 7) Find pathnames matching a pattern

(PHP 4, PHP 5, PHP 7) Makes directory bool mkdir

(PHP 4, PHP 5, PHP 7) Open directory handle resource

(PHP 4 >= 4.3.0, PHP 5, PHP 7) Reads entire file into a string

(PHP 4, PHP 5, PHP 7) Deletes a file bool unlink

(PHP 4, PHP 5, PHP 7) Sets access and modification time of file

(PHP 4, PHP 5, PHP 7) Create a hard link bool

(PHP 5, PHP 7) Write a string to a file int file_put_contents