gistfile1.php

<?php

//With the default lifetime
$sidebar = $this->viewCache->start("sidebar");
if ($sidebar === null) {
  echo '<!-- some sidebar code here -->';
  $this->viewCache->save();
} else {
  echo $sidebar;
}

//Setting a lifetime
$sidebar = $this->viewCache->start("sidebar");
if ($sidebar === null) {
  echo '<!-- some sidebar code here -->';
  $this->viewCache->save("sidebar", null, 3600);
} else {
  echo $sidebar;
}