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.

Answer 1

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;
}

Thanks