edit1

<?php
session_start();
if(isset($_POST['simpan'])!="")
{
//menyimpan gambar keserver//
if ((($_FILES["picture"]["type"]=="image/gif") || ($_FILES["picture"]["type"]=="image/jpeg") || ($_FILES["picture"]["type"]=="image/pjpeg") || ($_FILES["picture"]["type"]=="image/png")) && ($_FILES["picture"]["size"]<20000))
{
   if ($_FILES["picture"]["error"] > 0)
   {
     echo "Return Code:".$_FILES["picture"]["error"]."<br />";
   }
   else
   {
     echo "Upload:".$_FILES["picture"]["name"]."<br />";
     echo "Type: ".$_FILES["picture"]["type"]."<br />";
     echo "Size: ".($_FILES["picture"]["size"] / 1024)." Kb<br />";
     echo "Temp file: ".$_FILES["picture"]["tmp_name"]."<br />";

     if (file_exists("upload/" . $_FILES["picture"]["name"]))
     {
       echo $_FILES["picture"]["name"]."already exists. ";
     }
     else
     {
       move_uploaded_file($_FILES["picture"]["tmp_name"],"upload/" . $_FILES["picture"]["name"]);echo "Stored in: " . "upload/" . $_FILES["picture"]["name"];
       $file_name =$_FILES['picture']['name'];
     }
   }
}
else
{
echo "Invalid file";
}
//simpan kedatabases//
include "db.php";
$id=$_SESSION['id'];
$code=$_POST['code'];
$name_product=$_POST['name_product'];
$description=$_POST['description'];
$category=$_POST['category'];
$price=$_POST['price'];
$status=$_POST['status'];
$stock=$_POST['stock'];
if(isset($file_name)!=""){
$data=mysql_query ("UPDATE product SET code_product='$code', name_product='$name_product', category_product='$category', description_product='$description', price_product='$price', status_product='$status', stock_product='$stock',      picture_product='$file_name', author_product='$_SESSION[username]' where id_product='$id' ") or die (mysql_error());
}
else{
$data=mysql_query ("UPDATE product SET code_product='$code', name_product='$name_product', category_product='$category', description_product='$description', price_product='$price', status_product='$status', stock_product='$stock', author_product='$_SESSION[username]' where id_product='$id' ") or die (mysql_error());
}
if ($data){
    echo "<script> alert ('Data Telah Tersimpan'); </script>" ;
    include "index.php";
    }
else {
    echo "Anda gagal update";
}
}
?>