- var_dump: documentation ( source)
<?php
echo "1. \n";
$date = new DateTime();
$date->setISODate(2014, 32, 6);
var_dump($date->format('Y-m-d H:i:s'));
$d = new DateTime('2014-08-09');
var_dump($d->format('Y -- W -- w'));
echo "2. \n";
$date->setISODate(2014, 32, 0);
var_dump($date->format('Y-m-d H:i:s'));
$d = new DateTime('2014-08-10');
var_dump($d->format('Y -- W -- w'));
echo "3. \n";
$date->setISODate(2014, 33, 1);
var_dump($date->format('Y-m-d H:i:s'));
$d = new DateTime('2014-08-11');
var_dump($d->format('Y -- W -- w'));