+ /**
+ * Change the ownership of a file / folder.
+ *
+ * @since Unknown
+ *
+ * @param string $file Path to the file.
+ * @param mixed $owner A user name or number.
+ * @param bool $recursive Optional. If set True changes file owner recursivly. Defaults to False.
+ * @return bool Returns true on success or false on failure.
+ */
+ function chown( $file, $owner, $recursive = false ) {