In addition to these wrappers, as of PHP 4.3, you can write your own wrappers using PHP script and stream_register_wrapper().
The following is a list of the various URL style protocols that PHP has built-in for use with the filesystem functions such as fopen() and copy(). In addition to these wrappers, as of PHP 4.3, you can write your own wrappers using PHP script and stream_register_wrapper().