Question

我试图找到两个具有两个日期时间和一组日期时间的指数。我想找到两个日期的索引，其中时间最接近datetime数组中的可用时间。这是我尝试过的：

$label = array();
$price = array();
$linePoints = array();

$ind = 0;
// format example $oT = '2018-05-05 12:05:55'
$checkOpen = strtotime($oT);
$checkClose = strtotime($cT);

while ($run = mysqli_fetch_object($query)){
    $p = $run->price;
    $l = $run->time;
    array_push($price, $p);
    array_push($label, $l);

    // format example: $l = '2018-05-05 12:05:52' 

    $check = strtotime($l);

    $dif = abs($checkOpen - $check);
    if($dif < 10){
        array_push($linePoints, $ind);
    }

    $dif = abs($checkClose - $check);
    if($dif < 10){
        array_push($linePoints, $ind);
    }

    $ind = $ind +1;

}

此方法的问题在于，由于时间差以毫秒为单位计算，因此该方法可能带来多个匹配项？最后，我只希望数组$linePoints中有两个索引。关于如何实现这一点的任何想法？谢谢！

Answer 1

对于此工作，数据库比PHP快得多。您将获得简单性和性能。

if($run = mysqli_query($con,"SELECT event_id FROM Table ORDER BY ABS( DATEDIFF( time, $checkOpen ) ) LIMIT 1")){
$price1 = $run->price;
$label1 = $run->label
}

if($run = mysqli_query($con,"SELECT event_id FROM Table ORDER BY ABS( DATEDIFF( time, $checkClose ) ) LIMIT 1")){
$price2 = $run->price;
$label2 = $run->label
}

Answer 2

那么，您在这里。您的代码现已修复。

$label = array();
$price = array();
$linePoints = array();

$ind = 0;
// format example $oT = '2018-05-05 12:05:55'
$checkOpen = strtotime($oT);
$checkClose = strtotime($cT);

while ($run = mysqli_fetch_object($query)){

    $p = $run->price;
    $l = $run->time;
    array_push($price, $p);
    array_push($label, $l);

    // format example: $l = '2018-05-05 12:05:52' 

    $check = strtotime($l);

    $dif = abs($checkOpen - $check);
    if($dif < abs ($checkOpen - $linePoints[0]){
        $linePoints[0] = $ind);
    }

    $dif = abs($checkClose - $check);
    if($dif < $checkClose - $linePoints[1]){
        $linePoints[1] = $ind;
    }

    $ind = $ind +1;

}

PHP查找索引，其中时间差异与日期时间数组相比最小

2 个答案: