You can calculate the difference between two DateTime objects in months and years by using the DateTime and DateInterval classes in PHP. Here's an example:
$firstDate = new DateTime('2021-01-15');
$secondDate = new DateTime('2019-07-10');
$interval = $firstDate->diff($secondDate);
$yearsDiff = $interval->format('%y');
$monthsDiff = $interval->format('%m');
echo "The difference is ${yearsDiff} years and ${monthsDiff} months.";
In this example, we create two DateTime objects representing two different dates. We then calculate the difference between these two dates using the diff() method of the first DateTime object.
The diff() method returns a DateInterval object that represents the difference between the two dates. We can then use the format() method of the DateInterval object to extract the difference in years and months.
Finally, we can use the extracted values to display the difference between the two dates in terms of years and months.