<?php
$date = "2022-08-12";
// Add days to date and display it
echo date('Y-m-d', strtotime($date. ' +10 days')); // 2022-08-22
echo date('Y-m-d', strtotime(date('Y-m-d'). ' +1 days')); // 2022-08-23
echo date('Y-m-d', strtotime(date('Y-m-d'). ' +1 months')); // 2022-09-12
echo date('Y-m-d', strtotime(date('Y-m-d'). ' +1 year')); // 2023-08-12
?>