11.
What function can you use to create your own streams using the PHP stream wrappers and register them within PHP?

14.
Which of the following operations cannot be performed using the standard ftp:// stream wrapper? 
1. Reading a file
2. Writing a file
3. Establishing a stateful connection and changing directories interactively
4. Creating a new directory

15.
What will the following script do?
<?php
echo getservbyname ('ftp', 'tcp');
?>

17.
When dealing with timeout values in sockets, the connection timeout can be changed independently of the read/write time out. Which function must be used for this purpose?