Intervalo de datas no PHP5.3+

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// data inicial
$start    = new DateTime( '2012-12-11' );
//data final
$end      = new DateTime( '2012-12-12' );
// intervalo
$interval = DateInterval::createFromDateString('1 hour');
 
$period   = new DatePeriod($start, $interval, $end);
 
foreach ( $period as $dt ) {
    echo $dt->format( 'd/m/Y H:i:s');
}