Time question

[AV1611]

I have a script that is a math speed drill for my kids (see it in action at http://blmservices.com/~osprey/school/mathdrill.php)

 

It simply gives them 50 match problems, and when they finish it gives them a score.

 

I now need to get the script to tell them how long they took.

 

Basically, I need to capture the time of the first time the script loads, then mark the time when the last time the script runs, and display how long it took....

 

I'm lousy with doing math on time...

 

Can someone suggest to me what time function to use?  I need only to know how many minutes and seconds they took.

 

here is the entire script if someone wants it for they're kids:

 

<STYLE TYPE="text/css">
<!--
TD{font-family: Verdana; font-size: 20pt;}
div{font-family: Verdana; font-size: 20pt;}
--->
</STYLE>
<div>
<center>
<?php
if(!isset($_GET['problem'])){
$problem=1;}
else
{$problem=$_GET['problem'];}

if($problem==51){
$correct=$_GET['correct'];
if(isset($_POST['answer']) && $_POST['answer']==$_GET['answer']){
	$correct=$correct+1;}
$grade=($correct/50)*100;
echo "<h2>Total Correct: ".$correct." Grade: ".$grade."%</h2>";
}
else
{

if(!isset($_GET['correct'])){
$correct=0;}
else
{$correct=$_GET['correct'];}


if(isset($_POST['answer']) && $_POST['answer']==$_GET['answer']){
$correct=$correct+1;}

echo "Problem: ";
echo $problem;
echo " Correct: ";
echo $correct;
echo "<br/><br/>";



$problem=$problem+1;
$top=rand(1, 99);
$bottom=rand(1, 99);
$answer=$top+$bottom;
echo "<table>";
echo "<tr><td align='right'>";
echo $top;
echo "</td></tr>";
echo "<tr><td align='right'>";
echo "+".$bottom;
echo "</td></tr>";
echo "<tr><td align='right'>";
echo "<form name='sform' METHOD='POST' action='http://blmservices.com/~osprey/school/mathdrill.php?problem=$problem&correct=$correct&answer=$answer'>";
echo '<input type="text" SIZE="10" name="answer">';
echo "</td></tr>";
echo "<tr><td align='right'>";
echo "<input type='submit' name='Submit' value='Answer'>";
echo "</td></tr>";
echo "</table>";
}
echo "<h2><a href=./mathdrill.php?problem=1>Start Again</a></h2>";
?>
</center></div>

[danrah]

i think using seconds since epoch and using date() may be a good idea.

[Barand]

At start of test

$_SESSION['startsecs'] = time();

 

At end of test

$endsecs = time();
$timeTaken = $endsecs - $_SESSION['startsecs'];
$mins = floor ($timeTaken / 60);
$secs = $timeTaken % 60;

printf ("You took %d mins %02d secs to complete the test", $mins, $secs);