php difference between two dates in years months and days

1//get Date diff as intervals 
2$d1 = new DateTime("2018-01-10 00:00:00");
3$d2 = new DateTime("2019-05-18 01:23:45");
4$interval = $d1->diff($d2);
5$diffInSeconds = $interval->s; //45
6$diffInMinutes = $interval->i; //23
7$diffInHours   = $interval->h; //8
8$diffInDays    = $interval->d; //21
9$diffInMonths  = $interval->m; //4
10$diffInYears   = $interval->y; //1
11
12//or get Date difference as total difference
13$d1 = strtotime("2018-01-10 00:00:00");
14$d2 = strtotime("2019-05-18 01:23:45");
15$totalSecondsDiff = abs($d1-$d2); //42600225
16$totalMinutesDiff = $totalSecondsDiff/60; //710003.75
17$totalHoursDiff   = $totalSecondsDiff/60/60;//11833.39
18$totalDaysDiff    = $totalSecondsDiff/60/60/24; //493.05
19$totalMonthsDiff  = $totalSecondsDiff/60/60/24/30; //16.43
20$totalYearsDiff   = $totalSecondsDiff/60/60/24/365; //1.35

1function numWeeks($dateOne, $dateTwo){
2    //Create a DateTime object for the first date.
3    $firstDate = new DateTime($dateOne);
4    //Create a DateTime object for the second date.
5    $secondDate = new DateTime($dateTwo);
6    //Get the difference between the two dates in days.
7    $differenceInDays = $firstDate->diff($secondDate)->days;
8    //Divide the days by 7
9    $differenceInWeeks = $differenceInDays / 7;
10    //Round down with floor and return the difference in weeks.
11    return floor($differenceInWeeks);
12}
13
14$numOfWeek = numWeeks('2021-01-21', '2021-01-28');