Implementing Timer in PHP and Sleep function

Question

I am creating an PHP application in which i want to set a timer of 15 minutes for a particular section of test. If the student doesn't complete the section in 15 minutes the scores are saved and the student is navigated to the next section.

So i want to create a timer and want to display the current time left. But i don't know how to implement it and also if we use sleep() function that will it interrupt the working of other functions as well.

this can be done via JS

Niklesh Raut
– Niklesh Raut

2017-03-11 06:21:08 +00:00
Commented Mar 11, 2017 at 6:21 — Niklesh Raut
– Niklesh Raut, Commented Mar 11, 2017 at 6:21
But i cant save the scores of students in Db via JS

Aarthna Maheshwari
– Aarthna Maheshwari

2017-03-11 06:25:32 +00:00
Commented Mar 11, 2017 at 6:25 — Aarthna Maheshwari
– Aarthna Maheshwari, Commented Mar 11, 2017 at 6:25
using ajax you can save students scores in database.

Niklesh Raut
– Niklesh Raut

2017-03-11 06:26:17 +00:00
Commented Mar 11, 2017 at 6:26 — Niklesh Raut
– Niklesh Raut, Commented Mar 11, 2017 at 6:26

Neil · Accepted Answer · 2017-03-14 08:09:57Z

2

You can't use PHP for this. If you do, then it will simply freeze the page on page load for 15 seconds and then tell the student time has expired.

So, you should write it in JavaScipt like this:

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
<script>
currentMinute = 0;
myTimer = setInterval(function () {
    if (currentMinute > 15) {
        clearInterval(myTimer);
        //send post data that the user's time is up
        return;
    }
    $.post("sendData.php", {
        "timeIsUp" : true
    }, function (data) {
        console.log("done sending time has expired to server");
    });
    currentMinute++;
}, 60 * 1000);
</script>

edited Mar 14, 2017 at 8:09

answered Mar 11, 2017 at 6:22

Neil

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7 Comments

Aarthna Maheshwari Over a year ago

But i cant save the scores of students in Db via JS

Neil Over a year ago

I added some code that will send data to a file called sendData.php like a form would in html when the time has expired.

Neil Over a year ago

You would insert your code to add it to the database inside sendData.php

Aarthna Maheshwari Over a year ago

Can you please explain the working of this function?

Neil Over a year ago

Sure, okay, so in 15,000 milliseconds (or seconds, or 15 * 1000 milliseconds), we access sendData.php with the $_POST['timeIsUp'] equal to true. Then, when we are done sending that information, we print "done sending..." to console.

|

Gyandeep Sharma · Accepted Answer · 2019-07-30 07:21:28Z

jQuery will help you on this...

Use below function for timer

var hours1=0, minutes1=0, seconds1=0;

function calculate() {

setTimeout(calculate, 1000);
if((hours==0)&&(minutes==0)&&(seconds==0)){$('#submit-btn').trigger('click');} // HERE YOU CAN SWITCH TO NEXT QUESTION
h1 = makeTwoDigit(hours);   m1 = makeTwoDigit(minutes); s1 = makeTwoDigit(seconds);
h2 = makeTwoDigit(hours1);  m2 = makeTwoDigit(minutes1);    s2 = makeTwoDigit(seconds1);
$('title').html(h1+':'+m1+':'+s1);
$('#time-taken').val(h2+':'+m2+':'+s2);
$('#minutes').html(m1);
$('#seconds').html(s1);

seconds--; 
if (seconds < 0) { 
    seconds = 59; minutes--;

    if (minutes < 0) {
        hours--;
        minutes = 59;                        
    }
}
seconds1++; 
if (seconds1 > 59) { 
    seconds1 = 00; minutes1++;      
    if (minutes1 >59) {
        hours1++;
        minutes1 = 00;                        
    }
}

}

function makeTwoDigit(num) {
    if (num < 10) { return "0" + num;} return num;
}

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