用于在线考试系统的计时器，用于存储每个单独部分的时间

我正在开发一个在线考试，我需要在整个考试期间显示一个倒计时计时器/时钟。此外，在显示最终结果的同时，还应显示解决每个单独问题所花费的时间以及测试所花费的总时间。

实现此功能的最佳方法是什么？？

<?php
$countfile = "counter.txt";
// location of site statistics.
$statsfile = "stats.txt";
// checks whether the file exist, if not then server will create it.
if (file_exists($countfile)) {
// open the counter hit file.
$fp = fopen($countfile, "r"); 
// reads the counter hit file and gets the size of the file.
$output = fread($fp, filesize($countfile));
// close the counter hit file.
fclose($fp); 
// get the integer value of the variable.
$count = intval($output);
}
// if file is doesn't exist, the server will create the counter hit file and gives a value of zero.
else { 
$count = 0;
}
// showcount function starts here.
function ShowCount() { 
// declares the global variables.
global $ShowCount, $countfile, $statsfile, $count;
// get the current month.
$month = date('m');
// get the current day.
$day = date('d');
// get the current year.
$year = date('Y');
// get the current hour.
$hour = date('G');
// get the current minute.
$minute = date('i');
// get the current second.
$second = date('s');
// this is the date used in the stats file
$date = "$month/$day/$year $hour:$minute:$second";
// this is the remote IP address of the user.
$remoteip = getenv("REMOTE_ADDR");
// some of the browser details of the user.
$otherinfo = getenv("HTTP_USER_AGENT");
// retrieve the last URL where the user visited before visiting the current file.
$ref = getenv("HTTP_REFERER");
// open the statistics file. 
$fp = fopen($statsfile, "a");
// put the given data into the statistics file.
fputs($fp, "Remote Address: $remoteip | ");
fputs($fp, "Information: $otherinfo | ");
fputs($fp, "Date: $date | ");
fputs($fp, "Referer: $ref'n");
// close the statistics file.
fclose($fp);
// adds 1 count to the counter hit file.
$count++;
// open the counter hit file.
$fp = fopen($countfile, "w");
// write at the counter hit file.
// if the value is 34, it will be changed to 35.
fwrite($fp, $count);
// close the counter hit file.
fclose($fp);
// showcount variable is equal to count variable.
$ShowCount = $count;
// return the value of the count variable into showcount variable.
return $ShowCount;
}
// display the value in the counter hits file.
echo showcount(), " visits";
?> 

我正在使用这个脚本来跟踪访问者的统计数据和访问时间。。。它运行良好。但我无法跟踪每个考试类别中单个问题的时间（每个考试有多个类别，有多个问题）。需要帮助