What is difference between the function Unlink() and Unset()?

Question

I have started learning PHP and got a thought about mysql.

I did google and found this stack overflow link
http://stackoverflow.com/questions/625930/what-is-the-maximum-size-of-a-mysql-database-in-version-5-and-up

But there are less answers and more discussions. Can someone give me the right answer which has full description in it.

Answer 1

unlink() function : It is a function for file system handling. It will simply delete the file in context.

unset() function : It is a function for variable management. It will make a variable undefined.

Answer 2

Unlink () function deletes the given file from the file system. whereas Unset() function makes a variable undefined.

Answer 3

unlink: It is used to remove the file from server.

unlink('/path/file.phtml');

unset: It is used to remove the variable.

unset($variableName);