php计算两个日期相差天数的方法

<?php

function diffBetweenTwoDays ($day1, $day2)
{
  $second1 = strtotime($day1);
  $second2 = strtotime($day2);
    
  if ($second1 < $second2) {
    $tmp = $second2;
    $second2 = $second1;
    $second1 = $tmp;
  }
  return ($second1 - $second2) / 86400;
}
$day1 = "2013-07-27";
$day2 = "2013-08-04";
$diff = diffBetweenTwoDays($day1, $day2);
echo $diff."n";

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