PHP function application returns the number of days difference between two given dates

In the previous article, we introduced the method of using PHP functions to check whether a given value is finite, infinite or non-numeric. If you are interested, you can click on the link to check → "Checking a given value using PHP functions Whether the value is finite, infinite, or non-numeric》. This time we continue to learn PHP functions and introduce the method of calculating the number of days between two dates. If you need it, you can learn about it~

The focus of this article is to teach you how to calculate the difference between two dates. The number of days between. Here are two methods to introduce to you. You can do it locally first to see if the implementation method is the same as mine.

Let’s first look at the first method: using the strtotime() function

Implementation method:

• Combine the two dates Use the strtotime() function to convert to a timestamp;

• Then subtract the two timestamps to get the time difference, but this time it is still counted in seconds, which is not conducive to reading.

• Then divide the time by 86400 (24*60*60=86400), and then use floor() to round down to the nearest integer

The implementation code is given directly below:

<?php
header("content-type:text/html;charset=utf-8");
function daysDiff($date1, $date2)
{
    $first = strtotime($date1);
    $second = strtotime($date2);
    if($first>$second){
    	$diff_seconds=$first-$second;
    }else{
    	$diff_seconds=$second-$first;
    }
	$time = floor(($diff_seconds)/86400);
    return $time;
}

$dt1 = &#39;2021-8-1&#39;;
$dt2 = &#39;2021-8-27&#39;;
echo $dt1.&#39; 和 &#39;. $dt2. &#39; 之间相差的天数是 &#39;. daysDiff($dt1, $dt2) ."天";
?>

Output result:

If you find this method a bit troublesome, we will introduce it below Another easier method: Use the date_diff() function

The date_diff() function can directly return the difference between two DateTime objects. We only need to convert the two specified dates into DateTime objects, and then use date_diff(datetime1,datetime2) to get the number of days between them.

The implementation code is given directly below:

<?php
header("content-type:text/html;charset=utf-8");
function daysDiff($date1, $date2)
{
    $date1=date_create($date1);
	$date2=date_create($date2);
	$diff_seconds=date_diff($date1,$date2);


    return $diff_seconds->format("%R%a");
}

$dt1 = &#39;2020-03-15&#39;;
$dt2 = &#39;2021-12-12&#39;;
echo $dt1.&#39; 和 &#39;. $dt2. &#39; 之间相差的天数是 &#39;. daysDiff($dt1, $dt2) ." 天";
?>

Output result:

That’s it for now, if there is anything else you want to know Yes, you can click this. → →php video tutorial

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