- print_r: documentation ( source)
<?php
$zona = new DateTimeZone("America/Sao_Paulo");
$inicio = new DateTime("2014-02-15 08:00", $zona);
$fim = new DateTime("2014-02-16 08:00", $zona);
$segundosDiferenca = $fim->getTimestamp() - $inicio->getTimestamp();
$dtF = new \DateTime("@0");
$dtT = new \DateTime("@$segundosDiferenca");
print_r($dtF->diff($dtT));