Question

有很多关于检查两个日期之间重叠的帖子。但是我找不到任何关于如何在多个范围之间进行检查的内容。

说我有这个数组：

$ranges = [
array('start'=>'2014-01-01' , 'end'=> '2014-01-05'),
array('start'=>'2014-01-06' > , 'end'=> '2014-01-10'),
array('start'=>'2014-01-04' > , 'end'=> '2014-01-07')]

可以简单地认为检查两个范围之间重叠的函数可以在所有范围之间使用循环，但这是错误的，因为所有范围可以彼此重叠，但不会重叠在一起。

我希望有人能帮助我找到一个好的解决方案......

Answer 1

<?php

// pass your ranges to this method and if there is a common intersecion it will
// return it or false

function checkIfOverlapped($ranges)
{
    $res = $ranges[0];

    $countRanges = count($ranges);

    for ($i = 1; $i < $countRanges; $i++) {

        $r1s = $res['start'];
        $r1e = $res['end'];

        $r2s = $ranges[$i]['start'];
        $r2e = $ranges[$i]['end'];

        if ($r1s >= $r2s && $r1s <= $r2e || $r1e >= $r2s && $r1e <= $r2e || $r2s >= $r1s && $r2s <= $r1e || $r2e >= $r1s && $r2e <= $r1e) {

            $res = array(
                'start' => $r1s > $r2s ? $r1s : $r2s,
                'end' => $r1e < $r2e ? $r1e : $r2e
            );

        } else return false;

    }

    return $res;
}

// example
$ranges = array(
    array('start' => '2014-01-01', 'end' => '2014-01-05'),
    array('start' => '2014-01-05', 'end' => '2014-01-10'),
    array('start' => '2014-01-04', 'end' => '2014-01-07')
);

var_dump(checkIfOverlapped($ranges));

Answer 2

以上解决方案都没有真正适合我，我在这里使用Carbon API进行日期比较，但是如果您不使用Carbon API，则可以通过常规的PHP日期比较来实现。

PS：很高兴有人可以优化此代码。

public static function checkOverlapInDateRanges($ranges) {
    $overlapp = [];
    for($i = 0; $i < count($ranges); $i++){
        for($j= ($i + 1); $j < count($ranges); $j++){

            $start = \Carbon\Carbon::parse($ranges[$j]['start']);
            $end = \Carbon\Carbon::parse($ranges[$j]['end']);

            $start_first = \Carbon\Carbon::parse($ranges[$i]['start']);
            $end_first = \Carbon\Carbon::parse($ranges[$i]['end']);

            if(\Carbon\Carbon::parse($ranges[$i]['start'])->between($start, $end) || \Carbon\Carbon::parse($ranges[$i]['end'])->between($start, $end)){
                $overlapp[] = $ranges[$j];
                break;
            }
            if(\Carbon\Carbon::parse($ranges[$j]['start'])->between($start_first, $end_first) || \Carbon\Carbon::parse($ranges[$j]['end'])->between($start_first, $end_first)){
                $overlapp[] = $ranges[$j];
                break;
            }
        }
    }
    return $overlapp;
}

Answer 3

基于Raeef Refai的回答，该算法仅检查彼此相邻的日期，而不检查日期范围的整个列表。这是经过调整的版本。希望这会有所帮助。

$ranges = [
    ['2014-01-01','2014-01-05'],
    ['2014-01-05','2014-01-10'],
    ['2014-01-04','2014-01-07']
];

foreach($ranges as $key => $range){

  $r1s = $range[0];
  $r1e = $range[1];

  foreach($ranges as $key2 => $range2){
    if($key != $key2){
      $r2s = $range2[0];
      $r2e = $range2[1];

      if ($r1s >= $r2s && $r1s <= $r2e || $r1e >= $r2s && $r1e <= $r2e || $r2s >= $r1s && $r2s <= $r1e || $r2e >= $r1s && $r2e <= $r1e) {

          $res = array(
              '0' => $r1s > $r2s ? $r1s : $r2s,
              '1' => $r1e < $r2e ? $r1e : $r2e
          );
          break;
      }
    }
  }
}

如何检查PHP中多个日期范围之间的重叠？

3 个答案: