Answers for "7. write a program to create a session, to set a value in session, and to remove data from a session."

session unset

// Destroy a sesion variable name 'variable_name' 
<?php
unset($_SESSION['variable_name']);
?>

learn difference between session unset and session destroy

session unset: unset($_SESSION['id']);	//remove perticular session variable
session destroy: session_destroy();		//remove all session variable