PHP Countdown Timer

<?php
session_start();
date_default_timezone_set('Asia/Colombo');
if(!isset($_SESSION['expire'])){
$_SESSION['expire'] = time()+3600;
}

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Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store