计算剩余天数

时间:2014-04-25 20:53:09

标签: php calculator

我有一个学校项目,我必须制定议程。我的计算功能有问题。因此,下面的函数需要计算剩余的天数,直到我的下一次约会。我有一个未来的日期($ timefromdb)存储在我的mysql数据库中,我想从我的数据库中计算当前日期和日期之间的差异。

    public function getAllAfspraken(){
    $db = new Db();
    $sql = "SELECT * FROM `tblafspraken`";
    $return = $db->conn->query($sql);

        while($row = mysqli_fetch_array($return))
        {
        $currentdate= date("Y-m-d"); 
        $timefromdb = $row['af_datum'];
        $timeleft = $currentdate-$timefromdb;
        $daysleft = round((($timeleft/24)/60)/60); 
        echo "<h3>".$row['af_datum']."</h3>";   
        echo "<p>" .$row['af_beschrijving']. "</p>";
        echo $daysleft;
        echo "<hr />";
        }
    }

4 个答案:

答案 0 :(得分:2)

使用DateTime:diff进行计算

$date1 = new DateTime("2014-04-30");
$now = new DateTime();

$diff = $date1->diff($now);

echo 'Remaining Days ::'. $diff->days ;

以上将显示+ ve或-ve

您还可以使用$diff->format('%R%a days'); for + ve或-ve

//print_r($diff);

$diff的完整数据如下所示,可以找到不同参数的差异,如天,小时,分钟等。

DateInterval Object
(
    [y] => 0
    [m] => 0
    [d] => 4
    [h] => 10
    [i] => 3
    [s] => 46
    [weekday] => 0
    [weekday_behavior] => 0
    [first_last_day_of] => 0
    [invert] => 1
    [days] => 4
    [special_type] => 0
    [special_amount] => 0
    [have_weekday_relative] => 0
    [have_special_relative] => 0
)

答案 1 :(得分:1)

我会尝试使用strtotime函数来转换这两个值:

    $currentdate= strtotime( date("Y-m-d") );   
    $timefromdb = strtotime( $row['af_datum'] );  
    $daysleft = ($timefromdb - $currentdate)/(60 * 60 * 24);  

http://www.php.net/manual/en/function.strtotime.php

答案 2 :(得分:1)

尝试使用MySQL:

$sql = "SELECT *,  DATEDIFF(NOW(), af_datum) AS timeleft FROM `tblafspraken`";

此外,您的代码看起来似乎已经找到了几天,而不是剩余的天数。如果结果不正确,请尝试使用DATEDIFF(af_datum,NOW())。

http://dev.mysql.com/doc/refman/5.5/en/date-and-time-functions.html#function_datediff

答案 3 :(得分:0)

您可以更进一步,并计算年,月,日,小时等...例如,如果您使用MySQL日期格式,这样的函数可能会起作用:

function get_time_diff($start_date, $end_date = null) {
    // make sure start date is in mysql datetime format
    $expr = "/^\d{4}-(0[1-9]|1[0-2])-(0[1-9]|[1-2][0-9]|3[0-1])\s([0-1][0-9]|2[0-3])(:[0-5][0-9]){2}?$/";
    if (!preg_match($expr, $start_date)) {
        return false;
    }

    if (isset($end_date)) {
        // make sure end date is in mysql datetime format
        if(!preg_match($expr, $end_date)) {
            return false;
        }

        list($date, $time) = explode(' ', $end_date);
        list($hour, $minute, $second) = explode(':', $time);
        $today = new DateTime($date);
        $today->setTime($hour, $minute, $second);
    } else {
        $today = new DateTime();
    }
    $target = new DateTime($start_date);
    $diff = $today->diff($target);

    if ($diff->y > 0) {
        echo $diff->y . ' year' . ($diff->y > 1 ? 's' : '') . ($diff->m > 0 ? ', ' : '');
    }
    if ($diff->m > 0) {
        echo $diff->m . ' month' . ($diff->m > 1 ? 's' : '') . ($diff->d > 0 ? ', ' : '');
    }
    if ($diff->d > 0) {
        echo $diff->d . ' day' . ($diff->d > 1 ? 's' : '') . ($diff->h > 0 ? ', ' : '');
    }
    if ($diff->h > 0) {
        echo $diff->h . ' hour' . ($diff->h > 1 ? 's' : '') . ($diff->i > 0 ? ', ' : '');
    }
    if ($diff->i > 0) {
        echo $diff->i . ' minute' . ($diff->i > 1 ? 's' : '') . ($diff->s > 0 ? ', ' : '');
    }
    if ($diff->s > 0) {
        echo $diff->s . ' second' . ($diff->s > 1 ? 's' : '');
    }
    return $today < $target ? ' until' : ' ago';
}

if ($test = get_time_diff('2012-09-11 10:25:00')) {
    echo $test;
} else {
    echo 'invalid request';
}

这会输出类似:1年,7个月,14天,5小时,58分钟,6秒之前

由于日期范围有限,你真的不应该使用strtotime()或unix时间戳。