如何通过PHP利用APC实现大文件上传进度条？

 if (function_exists('apc_fetch')) {
 echo 'it surpport apc model!';
 } else {
 echo "it's not support apc model!";
 }
 ?>

<?php
 $unid=uniqid("");//确定唯一标致，实现多人同时上传
?>
<div class="userinput2">
 <div id="captions">先将你要上传的软件上传服务器，上传时请耐心等候...<span class="style1"><br />
 </span>
 <script type="text/javascript" >
 var xmlHttp;
 var proNum=0;
 var loop=0;
 //初始化xmlHttp
 function createxml(){
 var xmlHttp;
 if(window.XMLHttpRequest){
 xmlHttp=new XMLHttpRequest();
 }else{
 xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
 }
 return xmlHttp;
 }
 xmlHttp=createxml();
 //ajas操作
 function sendURL() {
 var url="getprogress.php?progress_key=<?php echo $unid;?>";
 xmlHttp.open("GET",url,false);
 if (window.navigator.userAgent.indexOf("Firefox")>=1){
 //如果是firefox3.0
 xmlHttp.send("progress_key=<?php echo $unid;?>");
 if(xmlHttp.status==200) doHttpReadyStateChange();
 
 }else{
 xmlHttp.onreadystatechange = doHttpReadyStateChange;
 xmlHttp.send("progress_key=<?php echo $unid;?>");
 }
 }
 //回调函数
 function doHttpReadyStateChange() {
 if (xmlHttp.readyState== 4){
 proNum=parseInt(xmlHttp.responseText);
 //alert(proNum);
 document.getElementByIdx_x("progressinner").style.width = proNum+"%";
 document.getElementByIdx_x("showNum").innerHTML = proNum+"%";
 if ( proNum < 100){
 setTimeout("sendURL()", 200);
 }else{
 //上传成功后，还不能及时得到信息。还希望高人指点
 document.getElementByIdx_x("progressouter").style.display="none";
 document.getElementByIdx_x("progressinner").style.display="none";
 document.getElementByIdx_x("showNum").style.display="none";
 document.getElementByIdx_x("theframe").style.display="none";
 document.getElementByIdx_x("link2").style.display="block";
 }
 
 }
 }
 function startProgress(){
 document.getElementByIdx_x("progressouter").style.display="block";
 setTimeout("sendURL()", 200);
 }
 function newsofturl(text){
 document.getElementByIdx_x("link2").style.display="block";
 document.getElementByIdx_x("link2").value=text;
 }
 </script>
 <iframe id="theframe" name="theframe" src="softupload.php?id=<?php echo($unid); ?>" style="border: 0; height: 80px; width: 400px; " frameborder="0" scrolling="no" > </iframe>
 <input name="linkdefult" type="hidden" id="linkdefult" value="0" />
 <br />
 <div id="link2" style="display:none;" > <font size=2>上传成功! 文件大小为：
 <input type="text" name="filesize" id="filesize" style="width:50px;"/>
 </font><br>
 <br>
 <font size=2>文件下载地址为：</font><br />
 <input type=text name='link' id='link' style='width:380px;' />
 </div>
 <br/>
 <div id="progressouter" style="width: 500px; height: 20px; border: 1px solid #000000; display:none;">
 <div id="progressinner" style="position: relative; height: 20px; background-color: #333333; width: 0%; "></div>
 </div>
 <div id='showNum' style="font-size:12px; color:#333333"></div>
 </div>
</div>
 

<?php
 $id = $_GET['id'];
?>
<script language="javascript">
//Trim the input text
function Trim(input)
{
 var lre = /^\s*/;
 var rre = /\s*$/;
 input = input.replace(lre, "");
 input = input.replace(rre, "");
 return input;
 }
function CheckForTestFile()
 {
 var file = document.getElementByIdx_x('Softfile');
 var fileName=file.value; 
 //Checking for file browsed or not
 if (Trim(fileName) =='' )
 {
 alert("请为上传选择一个文件!!!");
 file.focus();
 return false;
 }
 //Setting the extension array for diff. type of text files
 var extArray = new Array(".rar", ".zip", ".exe", ".gz"); 
 //getting the file name
 while (fileName.indexOf("\") != -1)
 fileName = fileName.slice(fileName.indexOf("\") + 1);

 //Getting the file extension  
 var ext = fileName.slice(fileName.indexOf(".")).toLowerCase();
 for (var i = 0; i < extArray.length; i++)
 {
 if (extArray[i] == ext)
 {
 window.parent.startProgress(); return true;
 }
 }
 alert("正确的文件格式为" + (extArray.join(" ")) + "\n请选择一个新的 " + "文件提交上传.");
 file.focus();
 return false; 
 } 
</script> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<form enctype="multipart/form-data" id="upload_form" action="target.php" method="POST">
<input type="hidden" name="APC_UPLOAD_PROGRESS" id="progress_key" value="<?php echo $id?>"/>
<table width="322" border="0" cellpadding="0" cellspacing="0" id="linkTable">

 <tr>
 <td >1.选择软件<br />

 <input name="Softfile" type="file" id="Softfile" /></td>
 <td ><br />
 <input name="submit" type="submit" onclick="return CheckForTestFile();" value="上传软件"/></td>
 </tr>
 </table>
</form>

<script language="javascript">
//将上传后的信息返还给父窗口
function chuanzhi(){
parent.document.getElementByIdx_x('filesize').value=document.getElementByIdx_x('size').value;
parent.document.getElementByIdx_x('link').value=document.getElementByIdx_x('newsoftdir').value;
parent.document.getElementByIdx_x('linkdefult').value=1;
}
</script>
<body onLoad="chuanzhi();">
<?php
//header('Content-Type:text/html;charset=gb2312');
define('SOFTDIR', "./upload/"); //上传后路径
define('HTTPSOFTDIR', "http://www.mysite.com/"); //服务器的路径

//判断上传软件后缀名是否允许
function isSoftExt($extension) {
 $ext = array('exe', 'rar', 'zip','gz');
 return in_array($extension, $ext) ? true : false;
}
if($_SERVER['REQUEST_METHOD']=='POST'){
$errors['0'] = true;
$errors['1'] = '请选择上传的软件图片';
$errors['2'] = '上传软件图片失败';
$errors['3'] = '上传软件图片失败';
$daytime = date('Y-m-d-h-m-s');
$timename=str_replace("-","",$daytime); //取得当天的日期时间


 //检查软件是否是正常上传的
 if(!is_uploaded_file($_FILES['Softfile']['tmp_name'])) {
 echo "<script>alert('非正常上传！');history.back();</script>";
 exit;
 }
 $extension = pathinfo($_FILES['Softfile']['name'], PATHINFO_EXTENSION);
 $filename = $timename."_".$_FILES['Softfile']['name'];
 $tmpsize=$_FILES['Softfile']['size'];
 $msize=round($tmpsize/1048576 , 2) ."M";
 $ksize=round($tmpsize/1024 ,2). "K";
 $filesize =$tmpsize>1048576?$msize:$ksize;
 //检查软件文件格式
 if(!isSoftExt($extension)) {
 echo "<script>alert('上传的软件格式有错误！');history.back();</script>";
 exit;
 } 
 //移动软件
 if(!move_uploaded_file($_FILES['Softfile']['tmp_name'], SOFTDIR. $filename)) {
 echo "<script>alert('移动软件出错！');history.back();</script>";
 exit;
 }else{
 echo "<font size=2>上传成功! 文件大小为：<input type=text id='size' value='$filesize'></font><br>";
 echo "<font size=2>文件下载地址为：</font><input type=text id='newsoftdir' value='".HTTPSOFTDIR.$filename."' style='width=380'>";
 }
}else
echo "请不要直接输入地址！";

?>

<?php
//上传ajas获取进度页面
session_start();
if(isset($_GET['progress_key'])) {
 $status = apc_fetch('upload_'.$_GET['progress_key']);
 echo ($status['current']/$status['total'])*100;
}
echo 'APC_FILE='.APC_FILE;
?>