autonumber

<?php

if (isset($_POST['upload']))
{
    $name=$_FILES['file_video']['name'];
    $type=$_FILES['file_video']['type'];
    $size=$_FILES['file_video']['size'];
    //replace tanda spasi pada nama file dengan _
    $nama_file=str_replace(" ","_",$name);
    $tmp_name=$_FILES['file_video']['tmp_name'];
    $nama_folder="video/";
    $id=auto_number();
    $nama_file_baru=$nama_folder.basename($id);
    //Filter jenis file video dan ukuran file
    if ((($type == "video/mp4") || ($type == "video/3gpp")  || ($type == "video/x-flv")) && ($size < $_POST['MAX_FILE_SIZE']))
    {
        //cek jika nama dile sudah ada
        if (file_exists($nama_file_baru))
        {
            $msg="Nama file $nama_file sudah ada!\n";
        }
        else
        {
            //pindah file dari temporari ke alamat tujuan
            if(move_uploaded_file($tmp_name,$nama_file_baru))
            {
                $msg="File video $nama_file berhasil diupload";
            }
        }
    }
    else
    {
        $msg="Jenis file tidak sesuai atau ukuran file terlalu besar!";
    }
    echo "<p align=\"center\">$msg</p>";
}

else
{
?>
<html>
<head>
<title>Upload Video dengan PHP</title>
</head>
<body>
<div style="width:800px;margin:20px auto; text-align:center">
<fieldset>
<legend>Upload Video</legend>
<form name="fvideo" enctype="multipart/form-data" method="POST" action="" style="padding:10px;">
<input name="MAX_FILE_SIZE" value="50000000" type="hidden"/>
<input type="file" name="file_video" />
<input type="submit" name="upload" value="Kirim" />
</form>
</fieldset>
<?php
}
?>
</div>
</body>
</html>
<?php
function autonumber()
{
//query yang mendapatkan id terbaru + 1
//select max(id) from auto_number;

return $id;
}