php 计算两个日期的间隔天数

使用php内部自带函数实现

1、使用DateTime::diff 实现计算

参考阅读>>PHP DateTime::diff()

上代码：

<?php
$start = "2016-05-25";
$end = "2016-05-23";

$datetime_start = new DateTime($start);
$datetime_end = new DateTime($end);
var_dump($datetime_start->diff($datetime_end));

*结果*

object(DateInterval)[3]
  public 'y' => int 0
  public 'm' => int 0
  public 'd' => int 2
  public 'h' => int 0
  public 'i' => int 0
  public 's' => int 0
  public 'weekday' => int 0
  public 'weekday_behavior' => int 0
  public 'first_last_day_of' => int 0
  public 'invert' => int 1
  public 'days' => int 2
  public 'special_type' => int 0
  public 'special_amount' => int 0
  public 'have_weekday_relative' => int 0
  public 'have_special_relative' => int 0

由结果我们知道，想要得出时间差，可以用下面方法实现

$start = "2016-05-25";
$end = "2016-05-23";

$datetime_start = new DateTime($start);
$datetime_end = new DateTime($end);
$days = $datetime_start->diff($datetime_end)->days;
echo "时间差是:$days";

*最终结果为*

时间差是:2

2.date_create()、date_diff()实现

$start = "2016-05-25";
$end = "2016-05-23";

$datetime_start = date_create($start);
$datetime_end = date_create($end);
$days = date_diff($datetime_start, $datetime_end);
var_dump($days);

*打印结果*

object(DateInterval)[3]
  public 'y' => int 0
  public 'm' => int 0
  public 'd' => int 2
  public 'h' => int 0
  public 'i' => int 0
  public 's' => int 0
  public 'weekday' => int 0
  public 'weekday_behavior' => int 0
  public 'first_last_day_of' => int 0
  public 'invert' => int 1
  public 'days' => int 2
  public 'special_type' => int 0
  public 'special_amount' => int 0
  public 'have_weekday_relative' => int 0
  public 'have_special_relative' => int 0

具体实现：

$start = "2016-05-25";
$end = "2016-05-23";

$datetime_start = date_create($start);
$datetime_end = date_create($end);
$days = date_diff($datetime_start, $datetime_end)->days;
echo "时间间隔是：$days";

*结果*

时间间隔是：2

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