Need help with upload php code

[ChanHoNam]

Hi all, i am new here, but i have a working upload php working inside a flash file.....

 

It working perfectly fine with uploading file onto my website.  But i would like to add some code in it.

 

Example:  if you upload a file through it, i would like it to say " Your file have successfully uploaded"

                but i want to add the code, if you upload the same image.extension and same size, it would like it to say "Error - File exist!"

 

<?php
session_start();

$Directory     = "image/";      
$DAT     = "file/";      



$datei=$_GET['datei'];
$txt1=$_GET['txt1'];
$ok="0";
if ($_SESSION['ko']=="1") {
session_unset();
echo "&message=File ".$_SESSION['tempdatei']." u. Information Process!&";
}else{
session_unset();
echo "&message=Server Error or Error File exists!&";
}


if ($_FILES['Filedata']) {
if (preg_match("/^.*?\.(pdf|wav|mp3|mov|wmv|mpeg|exe|avi|mpg|rar|zip|flv|xls|ppt|doc|mdb|txt|jpg|gif|png|swf|jpeg)$/si",$_FILES['Filedata']['name'])) {
if($_FILES['Filedata']['size'] > 0 && $_FILES['Filedata']['size'] < 10485760) {
$uploadfile = $Directory.basename($_FILES['Filedata']['name']);
if (!file_exists($uploadfile)) {
move_uploaded_file($_FILES['Filedata']['tmp_name'], $uploadfile); 
$_SESSION['ko']=$ok;
$_SESSION['tempdatei']=$datei;
}else{
echo "&message=check me out!&";
}

    chmod( $Directory. basename( $_FILES['Filedata']['name']),0644); 
    if (!chmod( $Directory. basename( $_FILES['Filedata']['name']),0644)) { 
         fail("The permissions failed to set to 0644."); 
    }
$tx=$DAT.$datei.".txt";
$fp= fopen($tx,'w+');
fwrite($fp,$txt1);
fclose($fp);
$ok="1";
}}}
?>