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我在日期计算方面遇到了一些麻烦。我会尽可能多地解释它；

假设您有一个广告牌，并且该媒体具有有效的日期范围。例如，有效期限的开始日期是每年的 12 月 1 日，有效期限的结束日期是每年的 3 月 1 日。

假设您将此广告牌租给某人一段时间。示例日期范围为 2017 年 2 月 1 日至 2020 年 12 月 10 日。在此期间，我如何计算计费日期计数？试图用php来做，但卡住了。任何人都可以在没有太多“if”子句的情况下帮助我做到这一点？

编辑：

    $activeTermStart = "01/12"; // 'd/m'
    $activeTermEnd = "01/03"; // 'd/m'

    $daterangeStart = new \DateTime('2017-02-01');
    $daterangeEnd = new \DateTime('2020-12-10');

    //check if active term start&end have year diff
    $hasYearDiffBetweenTermStartAndEnd = false;

    $startArray = explode('/',$activeTermStart);
    $endArray = explode('/',$activeTermEnd);
    if ($startArray[1]>$endArray[1]) {
        $hasYearDiffBetweenTermStartAndEnd = true;
    }
    if ($startArray[1]==$endArray[1] && $startArray[0]>=$endArray[0]) {
        $hasYearDiffBetweenTermStartAndEnd = true;
    }

    $startTermWithYear = \DateTime::createFromFormat('d/m/Y',$activeTermStart.'/'.date('Y'));
    $startTermWithFirstYear = \DateTime::createFromFormat('d/m/Y',$activeTermStart.'/'.$daterangeStart->format('Y'));
    if ($hasYearDiffBetweenTermStartAndEnd) {
        $endTermWithYear = \DateTime::createFromFormat('d/m/Y',$activeTermEnd.'/'.(date('Y')+1));
        $endTermWithFirstYear = \DateTime::createFromFormat('d/m/Y',$activeTermEnd.'/'.((int)$daterangeStart->format('Y')+1);
    } else {
        $endTermWithYear = \DateTime::createFromFormat('d/m/Y',$activeTermEnd.'/'.date('Y'));
        $endTermWithFirstYear = \DateTime::createFromFormat('d/m/Y',$activeTermEnd.'/'.$daterangeStart->format('Y'));
    }

    $maximumBillableDaysPerYear = ($endTermWithYear->getTimestamp() - $startTermWithYear->getTimestamp())/60/60/24;

    $totalYearsToCheck = ((int)$daterangeEnd->format('Y') - (int)$daterangeStart->format('Y'))+1;

    $maximumBillableDaysTotal = $totalYearsToCheck *  $maximumBillableDaysPerYear;

    // from that moment on, i want to see how many days are not in the first year and
    // how many days are not in the last year. Remove them from the maximumBillableDaysTotal to
    // see how many days that billboard is billable for.
    // stucked here...
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