将格式化的时间值四舍五入到最接近的半小时 [英] Round formatted time value to the nearest half-hour

问题描述

我需要0:30到0:59向下舍入到0:30.
我需要0:00到0:29才能四舍五入到0:30.

I need 0:30 through 0:59 to round down to 0:30.
I need 0:00 through 0:29 to round up to 0:30.

例如:08:56将向下舍入到08:30，其中09:00和09:01将需要舍入到09:30.
秒应省略或四舍五入为:00

Example: 08:56 will round down to 08:30 where 09:00 and 09:01 will need to round up to 09:30.
Seconds should be omitted or rounded to :00

推荐答案

为什么不这样做:

$hour = date('H');
$minute = (date('i')>30)?'30':'00';
echo "$hour:$minute";

演示

更新
我刚刚意识到，您一直要求将时间四舍五入为:30:

UPDATE
I just realized that you asked all time to be rounded to :30:

$hour = date('H');
$minute = '30'; //always 30
echo "$hour:$minute";

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