Which of the following is used to create a session? * in php code example

Example 1: 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.";
?>

Example 2: $_SESSION php example

<?php
session_start();
echo session_id();
?>