Write a program to find no of days between two dates in Php?

The program to find no of days between two dates in PHP is as follows:

Let the dates are 25-09-2020 and 31-01-2021

<?php  

function dateDiffInDays($date1, $date2) 

{

    $diff = strtotime($date2) - strtotime($date1);

     return abs(round($diff / 86400));

}

$date1 = "25-09-2020";

$date2 = "31-01-2021";

$dateDiff = dateDiffInDays($date1, $date2);

printf("Difference between two dates: ". $dateDiff . " Days ");

?>