création de pdf à partir de tcpdf

bonjour,
j'essaie de généré un fichier pdf à partir de tcpdf, tout le passe bien le fichier pdf est bien crée, mon problème est que dans le rubrique facturation il y a plusieurs facture pdf , mais il n' y a qu'un seul fihier pdf qui se crée et quand tu telecharge c'est la même information. je suis confus dans ma tête je ne sais plus ou se trouve l'erreur, quelqu'un pourrait m'expliquer la procédure à suivre?

voici le code de génération du fichier pdf, c'est un peu long veuillez m'excuser

<?php
$name=$user['User']['nom'];
$adresse=$user['User']['adresse'];
$country=$user['User']['country'];

//$time  =$date;
//echo time;
//$dateMySQL = $time;
//$datte = new DateTime($dateMySQL);

App::import('Vendor','xtcpdf');

 class MYPDF extends TCPDF {

    //Page header
    public function Header() {
        // Logo
        $image_file = K_PATH_IMAGES.'allchapels.jpg';
        $this->Image($image_file, 10, 10, 15, '', 'JPG', '', 'T', false, 300, '', false, false, 0, false, false, false);
        // Set font

    }

    // Page footer
    public function Footer() {
        // Position at 15 mm from bottom
        $this->SetY(-15);
        // Set font
        $this->SetFont('helvetica', 'I', 8);
        // Page number
        $this->Cell(0, 10, 'Page '.$this->getAliasNumPage().'/'.$this->getAliasNbPages(), 0, false, 'C', 0, '', 0, false, 'T', 'M');
    }
}

$pdf = new MYPDF('L', PDF_UNIT, 'A4', true, 'UTF-8', false);
 // set document information
$pdf->SetCreator(PDF_CREATOR);
$pdf->SetAuthor('Allchaples');
$pdf->SetTitle('invoice');
$pdf->SetSubject('invoice allchaples');
$pdf->SetKeywords('Allchaples');

// set default header data
$pdf->SetHeaderData(PDF_HEADER_LOGO, PDF_HEADER_LOGO_WIDTH, PDF_HEADER_TITLE, PDF_HEADER_STRING);
// set header and footer fonts
$pdf->setHeaderFont(Array(PDF_FONT_NAME_MAIN, '', PDF_FONT_SIZE_MAIN));
$pdf->setFooterFont(Array(PDF_FONT_NAME_DATA, '', PDF_FONT_SIZE_DATA));

// set default monospaced font
$pdf->SetDefaultMonospacedFont(PDF_FONT_MONOSPACED);

// set margins
$pdf->SetMargins(PDF_MARGIN_LEFT, PDF_MARGIN_TOP, PDF_MARGIN_RIGHT);
$pdf->SetHeaderMargin(PDF_MARGIN_HEADER);
$pdf->SetFooterMargin(PDF_MARGIN_FOOTER);

// set auto page breaks
$pdf->SetAutoPageBreak(TRUE, PDF_MARGIN_BOTTOM);

// set image scale factor
$pdf->setImageScale(PDF_IMAGE_SCALE_RATIO);
$pdf->AddPage();

$html = <<<EOF
<!-- EXAMPLE OF CSS STYLE -->
<style>
    h1 {
        color: navy;
        font-family: times;
        font-size: 24pt;
        text-decoration: underline;
    }
    p.first {
        color: #003300;
        font-family: helvetica;
        font-size: 12pt;
    }
    p.first span {
        color: #006600;
        font-style: italic;
    }
    p#second {
        color: rgb(00,63,127);
        font-family: times;
        font-size: 12pt;
        text-align: justify;
    }
    p#second > span {
        background-color: #FFFFAA;
    }

    .first {
        color: #003300;
        font-family: helvetica;
        font-size: 8pt;
        border: 1px solid #cccccc;
    }

    .trait {

        background-color: #c4d3d8;
    }
    .td{
        border: 1px solid #cccccc;

    }

    .traite{
       background-color: #ebeeef;

    }
    .tva{
       background-color:#f2f2f2;

    }
    .ttc{
       background-color: #cccecf;
       color:#07748f;
    }
    .taille{
       font-family: helvetica;
       font-size: 11pt;
       color:#000000;
    }

    .tdd{
       font-family: helvetica;
       font-size: 7pt;
       color:#000000;
    }

    .lowercase {
        text-transform: lowercase;
    }
    .uppercase {
        text-transform: uppercase;
    }
    .capitalize {
        text-transform: capitalize;
    }
</style>

<table  cellpadding="0" cellspacing="0" border="0">
<tr>
<td width="656" align="left"></td>
<td width="263" align="left" calss="tdd">
 Facture acquittée : <b>$ref</b> <br>
 Date :<b>$time</b> <br>
 Date de paiement :<b>$time</b><br>
 Commande :<b>$commande</b><br>
</td>
</tr></table>

 <br><br>

 <table  cellpadding="0" cellspacing="0" border="0">
<tr>
<td width="570" align="left"></td>
<td width="349" align="left" >
Contact de facturation:<br>
 <table width="315"  cellpadding="4" cellspacing="0" class="first">
 <tr>
 <td width="281" height="88" class="taille">
$name<br>
$adresse<br>
$country
</td></tr></table>
</td>
</tr></table>

 <br><br><br>
<table class="first" cellpadding="4" cellspacing="0" border"1">
 <tr class="trait" >
    <td class="td">OFFRES</td>
        <td class="td">QUANTITE</td>
        <td class="td">PRIX UNITAIRE</td>
        <td class="td">PRIX HT</td>
    </tr>
    <tr>
        <td class="td">$nom</td>
        <td class="td">1</td>
        <td class="td">$price</td>
        <td class="td">$price</td>
    </tr>
     <tr class="traite">
       <td colspan="2"></td>
        <td class="td" align="right">Sous total</td>
        <td class="td">$price</td>
    </tr>
</table><br><br><br>

<table  cellpadding="0" cellspacing="0" border="0">
<tr>
<td width="599" align="left"></td>
<td width="320" align="left" >
<table class="first" cellpadding="4" cellspacing="0" border"1"  width="343" align="right">
 <tr>
        <td width="202" align="left"  class="td">PRIX HT</td>
        <td width="119" align="center"  class="td">$price</td>
    </tr>
    <tr class="tva">
        <td class="td" align="left">TVA (20%)</td>
        <td class="td" align="center"> - </td>
     </tr>
    <tr class="ttc">
        <td class="td" align="left"><b>TOTAL TTC</b></td>
        <td class="td" align="center"><b>$price</b></td>
    </tr>
</table>

</td>
</tr></table>
 EOF;

// output the HTML content
$pdf->writeHTML($html, true, false, true, false, '');
$pdf->lastPage();
echo $pdf->Output(WWW_ROOT . 'files'.DS.'pdf' . DS . 'facture.pdf', 'F');
?>