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 return $diff . " second" . plural($diff) . " ago";
9. $diff = round($diff/60);
10. if ($diff return $diff . " minute" . plural($diff) . " ago";
11. $diff = round($diff/60);
12. if ($diff return $diff . " hour" . plural($diff) . " ago";
13. $diff = round($diff/24);
14. if ($diff return $diff . " day" . plural($diff) . " ago";
15. $diff = round($diff/7);
16. if ($diff return $diff . " week" . plural($diff) . " ago";
17. return "on " . date("F j, Y", strtotime($date));
18. }

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