php upload progress not working, $_SESSION[$key] is empty - php

Question

I am trying to create a progress bar for multiple file i upload to a server!!! I am able to upload the files but when i try to fetch the upload progress information the session array is empty. Please do help!!! Please find below the information:
Firstly my main php page where i upload the files:
********************************************Main.php********************************
<?php session_start();?>//top of the page
<div id = "centerMain" align="center">
<iframe name="targetIframe" src="" style="width:50%;height:30%;position:relative;"></iframe>
<div id="addNewBlock" class="emboss blockPart" style="z-index:50000;padding:2%;position:relative;width:50%;left:25%;top:35%;border:1px solid black;">
<form method="POST" action="handleItemAddition.php" target="targetIframe" enctype = "multipart/form-data" onSubmit="return checkAndStartUpload()">
<!--VERY IMPORTANT:the hidden element should come first before any element within the form--> <input type="hidden" name="<?php echo ini_get("session.upload_progress.name"); ?>" id="hidUpProg" value="upFilesInfo" />
<script type ="text/javascript">
var upProgName = "<?php echo ini_get("session.upload_progress.name"); ?>";
//alert(document.getElementById("hidUpProg").value);
</script>
<div class="stayLeft">Upload Photo:</div><input style="width:40%;" type="file" name = "itemImage[]" id="fileUp" class = "stayRight" multiple/><br/><br/>
<input type="button" id = "closeBut" style="width:20%;" value = "close" onclick="closeBlock()" class="utsaaBut stayLeft"/>
<input type="submit" id = "AddBut" style="width:20%;" value = "Done" class="utsaaBut stayRight"/>
</form>
</div>
</div>
********************************************Main.php********************************
find below the javscript function which gets called onSubmit = "checkAndStartUpload()" from above
******************************************Javascript function****************************
function checkAndStartUpload()
{
var tmp = document.getElementById("fileUp");
if(tmp.files.length == 0)
{
alert("No file selected. Kindly select a file");
return false
}
$progressPtr = setInterval(handleProgress,50);
return true;
}
var it = 0;
function handleProgress()
{
//alert("handleProgress");
var xmlhttp;
if(window.XMLHttpRequest)
{
xmlhttp = new XMLHttpRequest();
}
else
{
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
//alert("response");
if(xmlhttp.readyState == 4 && xmlhttp.status == 200)
{
//alert("value:"+xmlhttp.responseText["content_length"]);
var res = xmlhttp.responseText;
alert("Response:"+res);
it++;
if(it == 25)
{
it = 0;
clearInterval($progressPtr);
}
}
}
xmlhttp.open("POST","handleProgressValue.php",true);
xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");
xmlhttp.send(upProgName+"=upFilesInfo");
}
******************************************Javascript function*******************
Next is the file which returns session value through ajax
******************************************ajax progress return*******************
<?php
$key = ini_get("session.upload_progress.prefix") .$_POST[ini_get("session.upload_progress.name")];
if (!empty($_SESSION[$key])) {
$current = $_SESSION[$key]["bytes_processed"];
$total = $_SESSION[$key]["content_length"];
echo "Current".$current."$total".$total;
//echo $current < $total ? ceil($current / $total * 100) : 100;
}
else {
echo "100"; //IT ALWAYS RETURNS 100 MEANING$_SESSION[$key] IS ALWAYS EMPTY
}
/*session_start();
$key = ini_get("session.upload_progress.prefix").$_POST[ini_get("session.upload_progress.name")];
//var_dump($_SESSION[$key]);
$tmp = $_SESSION[$key];
echo $tmp["bytes_processed"];*/
?>
******************************************ajax progress return*******************
And finally handleItemAddition.php successfully uploads the images.
I also disabled ;session.upload_progress.cleanup = On just for testing purpose so that if upload gets completed fast it should not clear the values.
Still i am getting empty array .

Answer 1

Hey guys sorry i forgot to update. I fixed the issue sometime back.
I had put session_start(); on top of all files but in handleProgressValue.php i had commented it while changing the code once i uncommented it worked.
However when i am uploading 28 files say, why does
count($_SESSION[$key]["files"])
return increasing values??? It first returned 10 then 17,24,28 and then $_SESSION got unset