Create a folder if it doesn't already exist

if (!file_exists('path/to/directory')) {
mkdir('path/to/directory', 0777, true);
}

Note that 0777 is already the default mode for directories and may still be modified by the current umask.

To copy file from one folder to another:

How to copy a file from one directory to another using PHP?

You could use the copy() function :

// Will copy foo/test.php to bar/test.php
// overwritting it if necessary

copy('foo/test.php', 'bar/test.php');

Quoting a couple of relevant sentences from its manual page :

Makes a copy of the file source to dest.

If the destination file already exists, it will be overwritten.