define vs session variable in php code example

Example 1: end session variable php

// destroy the session
<?php
session_destroy();
?>

Example 2: create session in php

<?php 
  // Start the session
  session_start();

  // Set session variables
  $_SESSION["color"]= "blue";
  $_SESSION["animal"]= "dog";
  echo "The session variable are set up.";
?>