How to calculate the number of days between two time periods in PHP?

This article will introduce you to how PHP calculates the number of days when two time periods intersect through code examples. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.

Without further ado, let me get straight to the code!

/**
 * 计算两个时间段之间交集的天数
 * @param $startDate1 开始日期1
 * @param $endDate1 结束日期1
 * @param $startDate2 开始日期2
 * @param $endDate2 结束日期2
 */
public function share_date_days($startDate1, $endDate1, $startDate2, $endDate2)
{
  $days = 0;
  $startDate1 = strtotime($startDate1);// 开始日期1
  $endDate1 = strtotime($endDate1);// 结束日期1
  $startDate2 = strtotime($startDate2);// 开始日期2
  $endDate2 = strtotime($endDate2);// 结束日期2
  
  /** ------------ 临界值换算 ------start------ */
  // 如果日期1的结束日期小于日期二的开始日期，则返回0
  if($endDate1 < $startDate2){
    $days = 0;
  }
  // 如果日期1的开始日期小于日期二的结束日期，则返回0
  if($startDate1 > $endDate2){
    $days = 0;
  }
  // 如果日期1的结束日期等于日期2的开始日期，则返回1
  if($endDate1 == $startDate2){
    $days = 1;
  }
  // 如果日期1的开始日期等于日期2的结束日期，则返回1
  if($startDate2 == $endDate1){
    $days = 1;
  }
  /** ------------ 临界值换算 ------end------ */
  
  /** ------------ 交集换算 ------start------ */
  // 如果开始日期1小于开始日期2，且开始日期2小于结束小于结束日期1
  if($startDate1 < $startDate2 && $endDate1 > $startDate2){
    // 如果结束日期1小于或者等于结束日期2
    if($endDate1 <= $endDate2){
      $days = $this->diffBetweenTwoDays($startDate2, $endDate1) + 1;
    }
    // 如果结束日期1大于结束日期2
    if($endDate1 > $endDate2){
      $days = $this->diffBetweenTwoDays($startDate2, $endDate2) + 1;
    }
  }
  
  // 如果开始日期1大于开始日期2，且开始日期1小于结束日期2
  if($startDate1 > $startDate2 && $startDate1 < $endDate2){
    // 如果结束日期1小于等于结束日期2
    if($endDate1 <= $endDate2){
      $days = $this->diffBetweenTwoDays($startDate1, $endDate2) + 1;
    }
    // 如果结束日期1大于结束日期2
    if($endDate1 > $endDate2){
      $days = $this->diffBetweenTwoDays($startDate1, $endDate2) + 1;
    }
  }
  // 开始日期1等于开始日期2
  if($startDate1 == $startDate2){
    // 结束日期1小于等于结束日期2
    if($endDate1 <= $endDate2){
      $days = $this->diffBetweenTwoDays($startDate1, $endDate1) + 1;
    }
    // 结束日期1大于结束日期2
    if($endDate1 > $endDate2){
      $days = $this->diffBetweenTwoDays($startDate1, $endDate2) + 1;
    }
  }
  // 结束日期1等于结束日期2
  if($endDate1 == $endDate2){
    // 开始日期1小于等于开始日期2
    if($startDate1 <= $startDate2){
      $days = $this->diffBetweenTwoDays($startDate2, $endDate1) + 1;
    }
    // 开始日期1大于开始日期2
    if($startDate1 > $startDate2){
      $days = $this->diffBetweenTwoDays($startDate1, $endDate1) + 1;
    }
  
  }
  // 时间段1在时间段2内
  if($startDate1 >= $startDate2 && $endDate1 <= $endDate2){
    $days = $this->diffBetweenTwoDays($startDate1, $endDate1) + 1;
  }
  // 时间段1包含时间段2
  if($startDate1 < $startDate2 && $endDate1 > $endDate2){
    $days = $this->diffBetweenTwoDays($startDate2, $endDate2) + 1;
  }
  /** ------------ 交集换算 ------end------ */
  
  return $days;
}

rrree

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