gistfile1.php

<?php

if (!empty($_GET['test'])) {
  if (!empty($_SESSION)) {
    foreach ($_SESSION as $name => $value) {
      echo $name . '<br />';
    }
  }
  foreach ($_COOKIE as $name => $value) {
    echo $name . '<br />';
  }
}
else {
  session_start();
  
  $_SESSION['s1'] = 'v1';
  $_SESSION['s2'] = 'v2';
  
  setcookie('c1', 'v1', time() + 1);
  setcookie('c2', 'v2', time() + 10);
  
  // delay 3 second
  sleep(3);
  
  header('Location: /?test=session-cookies');
}