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                ``` <?php function countDown($time){ $timeNow = time(); $timeOver = strtotime($time); $day = intval(($timeOver-$timeNow)/86400); $hour = intval((($timeOver-$timeNow)%86400)/3600); $minute = intval(((($timeOver-$timeNow)%86400)%3600)/60); $second = intval(((($timeOver-$timeNow)%86400)%3600)%60); echo "距離回家還有 <b>{$day}</b> 天 {$hour}小時{$minute}分{$second}秒!"; } countDown('2020-01-22 18:40:00'); ``` 首先用time函數獲取當前時間戳,再將期望到達的正常時間也就是“2020-01-23”使用strtotime函數解析為Unix 時間戳。 time:返回當前的 Unix 時間戳。 strtotime:將任何字符串的日期時間描述解析為 Unix 時間戳。 公式:3600表示一小時的秒數。86400表示一天的秒數。 ceil 向上取整(有小數就加1); floor 向下取整(有小數就減1); intval 表示直接取整; round 四舍五入取整;
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