tryphp_func_date_interval_create_from_date_string.php:
<!DOCTYPE html> <html> <body> <?php $date = date_create('2019-01-01'); date_add($date, date_interval_create_from_date_string('1 year 35 days')); echo date_format($date, 'Y-m-d'); ?> </body> </html>
2020-02-05