check two date in php code example

Example 1: php compare two dates

$today = date("Y-m-d");
$expire = $row->expireDate; //from database

$today_time = strtotime($today);
$expire_time = strtotime($expire);

if ($expire_time < $today_time) { /* do Something */ }

Example 2: date comparison function in php

Select if(Date('2020-10-01') > Date('2020-11-01'), '1', '2' ) as rslt_date