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php返回相对时间，如：20分钟前，3天前

  1. function plural($num) {
  2. if ($num != 1)
  3. return "s";
  4. }
  6. function getRelativeTime($date) {
  7. $diff = time() - strtotime($date);
  8. if ($diff<60)
  9. return $diff . " second" . plural($diff) . " ago";
  10. $diff = round($diff/60);
  11. if ($diff<60)
  12. return $diff . " minute" . plural($diff) . " ago";
  13. $diff = round($diff/60);
  14. if ($diff<24)
  15. return $diff . " hour" . plural($diff) . " ago";
  16. $diff = round($diff/24);
  17. if ($diff<7)
  18. return $diff . " day" . plural($diff) . " ago";
  19. $diff = round($diff/7);
  20. if ($diff<4)
  21. return $diff . " week" . plural($diff) . " ago";
  22. return "on " . date("F j, Y", strtotime($date));
  23. }

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