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@ 2014-11-21T19:06:58Z

<?php

foreach(range(0, 7) as $no) {
  $date1 = new DateTime('2014-01-01');
  $date2 = new DateTime("today +{$no} week");
  printf("Woche %d: %d\n", $no, $date1->diff($date2)->days / 7 % 3+1);
}

Output
Performance
VLD
References
Branches

range: documentation ( source)
printf: documentation ( source)

preferences:dark modelive preview

54 ms | 402 KiB | 5 Q