Kalan süreyi ölçmekte kullanabilirsiniz.
mesela Sınavlarda
örnek $_SESSION["mins"] : 5
5 dakika süre verilmiştir.Siz bu süreyi mins ve secs lerle oynayarak değiştirebilirsiniz.
?php
session_start();
$mins = isset($_SESSION["mins"]) ? $_SESSION["mins"] : 5;
$secs = isset($_SESSION["secs"]) ? $_SESSION["secs"] : 0;
?>
<html>
<head>
<style>
#txt {
border:2px solid red;
font-family:verdana;
font-size:16pt;
font-weight:bold;
background: #FECFC7;
width:80px;
text-align:center;
}
</style>
</head>
<body>
<form name="cd">
<input id="txt" name="txt" type="text" readonly="true">
</form>
<script>
var xmlhttp = false;
var mins = "<?php echo $mins ?>";
var secs = "<?php echo $secs ?>";
var secs1 = secs;
if(secs < 10){secs = "0" + secs;}
document.getElementById("txt").value = mins + ":" + secs;
secs = secs1;
var cd = setInterval("count_down_timer()",1000);
function count_down_timer()
{
if(secs == 0 && mins == 0)
{
clearInterval(cd);
alert("The time is up!");
}
else{if(secs == 0){secs = 59;mins–;}}
if(secs < 10){secs = "0" + secs;}
var tm = mins + ":" + secs;
document.getElementById("txt").value = tm;
send_request(mins,secs);
secs–;
}
function createRequest()
{
/*@cc_on @*/
/*@if (@_jscript_version >= 5)
// JScript gives us Conditional compilation, we can cope with old IE versions.
// and security blocked creation of the objects.
try {
xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try {
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
} catch (E) {
xmlhttp = false;
}
}
@end @*/
if (!xmlhttp && typeof XMLHttpRequest!='undefined') {
try {
xmlhttp = new XMLHttpRequest();
} catch (e) {
xmlhttp=false;
}
}
if (!xmlhttp && window.createRequest) {
try {
xmlhttp = window.createRequest();
} catch (e) {
xmlhttp=false;
}
}
return xmlhttp;
}
function send_request(m,s)
{
var conn = createRequest();
var url="update_session.php?min=" + m + "&sec=" + s;
conn.open("GET", url);
conn.send(null);
}
</script>
</body>
</html>
kaynak: ordan burdan
