Php subtract time saved in session with current time - php

Question

i am using jquery countdown timer but the problem is that timer start from value set every time on page refresh . I want to get time on first time and Save in PHP Session and subtract second time from frist time and update session etc. In Simple Word i want to create php countdown timer run only 50 using php
here is my controller code
public function actionViewtimer($id) {
$session = Yii::app()->session;
$this->layout = 'countdownlayout';
if (empty($session['countdowntime'])) {
$orderTime = microtime(true); #when user first time enter timer start from 50 mins
$session->add('countdowntime', array($orderTime)); //replace this line
} else {
$time_end = microtime(true);
$orderTime = $time_end - $time_start;
unset($session['countdowntime']);//unset old session
$session->add('countdowntime', array($orderTime)); //when user enter second
}
$getMinutes = $getMinutes_from_orderTime ; #please tell me how we extact minutes and pass them to view
$session->add('timersession', array($rand));
$this->render('viewtimerpage', array(
'getMinutes' => $getMinutes
));
}
here is my jquery code
<script>
$(function() {
$('#xlarge').countdowntimer({
minutes: 50<?php echo $getMinutes; ?>,
size: "lg",
timeUp: timeisUp
});
});
function timeisUp() {
alert('Time Complete');
return false;
}
</script>

Answer 1

Sorry, I've not used Yii so this example will be in plain PHP.
session_start();
if(!isset($_POST['counter']) || !is_array($_POST['counter')) {
$duration = 50;
$counter = array(
'start_time' => new DateTime()->format('Y-m-d H:i:s'),
'end_time' => new DateTime()->modify("+{$duration} minute")->format('Y-m-d H:i:s'),
'duration' => $duration
);
$_SESSION['counter'] = $counter;
}
$counter = $_POST['counter'];
$now = new DateTime();
$end_time = new DateTime($counter['end_time']);
$time_left = $end_time->getTimestamp() - $now->getTimestamp();
echo "{$time_left} seconds left";
This should be simple enough to convert, and you can easily convert seconds to minutes.

Answer 2

Don't destroy the session variable. Just set it the first time when its empty and then plug that value always into your countdown timer.
Inside you action
$session = Yii::app()->session;
$this->layout = 'countdownlayout';
if (empty($session['countdowntime'])) {
$date = new DateTime();
$date->modify('+50 minutes'); // Add 50 minutes to current time
$session['countdowntime'] = $date->format('Y/m/d H:i:s'); // Store date in session
}
$this->render('viewtimerpage', array(
'countdowntime' => $session['countdowntime'];
));
jQuery Code
$(function() {
$('#xlarge').countdowntimer({
dateAndTime : "<?php echo $countdowntime; ?>",
size: "lg",
timeUp: timeisUp
});
});

Answer 3

As I understand you want to show difference between 2 dates. Default value = 50 minutes(value for session if user first time opened page). If user refresh page after 10 minutes in view must show difference(40). It will be something like that:
public function actionViewtimer($id) {
$this->layout = 'countdownlayout';
/** #var CHttpSession $session */
$session = Yii::app()->session;
$minutes = 50; //default value for minutes
if (!$session->offsetExists('countdowntime')) {
$session->add('countdowntime', new DateTime()); //set value to session
} else {
$timeEnd = new DateTime();
/** #var DateTime $countDownTime */
$countDownTime = $session->get('countdowntime');
$interval = $countDownTime->diff($timeEnd);
$countMinutes = $interval->days * 24 * 60;
$countMinutes += $interval->h * 60;
$countMinutes += $interval->i;
$minutes -= $countMinutes;
$session->add('countdowntime', $timeEnd); //refresh value
}
// $session->add('timersession', array($rand)); don't know for what is it
$this->render('viewtimerpage', array(
'getMinutes' => $minutes
));
}
And js:
<script>
$(function() {
$('#xlarge').countdowntimer({
minutes: <?php echo $getMinutes; ?>, //without 50