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VOICI LE CODE/
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<?php 
session_start (); // création d'une nouvelle session ***********************
 
// variables de connexion **************************************************
$database	= "gestion_stock";
$user		= "root";
$pwd		= "";
$host    	= "localhost";
// fin variables de connexion **********************************************
 
//réinitialisation des sessions ********************************************
if(isset($_POST['reset']))
{
   session_unregister('selectp');
}
// fin réinitialisation des sessions ****************************************
 
// deselectionner un produit ***********************************************
$sDelProd = (isset($_GET['iDelProd'])) ? $_GET['iDelProd'] : '';
if($sDelProd !="")
{ if(isset($_SESSION['selectp']))
   {
     $aDelProd[$_GET['iDelProd']] = $_GET['iDelProd'];
     $aSelectedProdq              = explode(",", $_SESSION['selectp']);
	 foreach($aSelectedProdq as $k=>$v)
     {
      $aElem             = explode(":", $v);
	  $aSelectedProd[$aElem[0]] = $aElem[1];
	 }
 
	 $iNbr            = count($aSelectedProd);
 	 if($iNbr ==1) 
	  {
	   session_unregister('selectp');
	  }
	  else
	  {
       $aSelectedProd       = array_diff_key($aSelectedProd,$aDelProd);
	   $_SESSION['selectp'] = '';
	   foreach($aSelectedProd as $k=>$v)
       {
  	    $_SESSION['selectp'] = ($_SESSION['selectp'] == '') ? $k.':'.$v : $_SESSION['selectp'].','.$k.':'.$v;	  
	   }	   
	  }         
 
	 header('Location:Ajouter_facture.php');
   }
}
// fin deselctionner un produit *********************************************
 
// connexion au serveur mysql
mysql_pconnect($host,$user,$pwd) or die("Erreur d'accès au serveur Mysql");
// selection de la base de données
mysql_select_db($database)       or die("Erreur de selection de la base de données");
 
// Inialisation des variables utilisateur ********************************
$iSelectedProd = (isset($_POST['refp'])) ? $_POST['refp']          : '';
$iQteProd      = (isset($_POST['qte']))  ? (integer) $_POST['qte'] : '';
 
if($iSelectedProd != "" and is_int($iQteProd) and $iQteProd != 0) 
{
 if(isset($_SESSION['selectp']))   {$_SESSION['selectp'] .= ",".$iSelectedProd.':'.$iQteProd;
   }
   else{$_SESSION['selectp'] = $iSelectedProd.':'.$iQteProd;
   } 
}
// Fin Inialisation des variables utilisateur ****************************
 
$sSql        = "SELECT ref FROM produit";
 
$iRes        = mysql_query($sSql) or die(mysql_error());
 
$iNbr        = mysql_num_rows($iRes);
 
while($aData = mysql_fetch_assoc($iRes))
{
      $aListProd[$aData['ref']] = $aData['ref']; 
}
 
if(isset($_SESSION['selectp']) && isset($aListProd))
{
   $aSelectedProdq      = explode(",", $_SESSION['selectp']);
   foreach($aSelectedProdq as $k=>$v)
    {
     $aElem             = explode(":", $v);
	 $aSelectedProd[$aElem[0]] = $aElem[1];
	}
 
   $aProdNotSelected   = array_diff_key($aListProd,$aSelectedProd);
}
else
{
   $aProdNotSelected   = $aListProd;
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Facture</title>
 
<link href="styles.css" rel="stylesheet" type="text/css" />
 
</head>
 
<body>
  <form action="#" name="prod" method="post" enctype="multipart/form-data">
    <div id="Layer18"> <strong><?php echo date("d/F/Y"); ?></strong></div>
 
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<div id="Layer11"><span class="Style2"><strong>Client:
  </strong>
  </span>
  <div class="Style2" id="Layer12"><strong>Facture N&deg;: </strong></div>
  <label></label>
<?php require_once('Connections/connect.php'); ?>
            <?php
mysql_select_db($database_connect, $connect);
$query_Recordset1 = "SELECT identifiant FROM client";
$Recordset1 = mysql_query($query_Recordset1, $connect) or die(mysql_error());
$row_Recordset1 = mysql_fetch_assoc($Recordset1);
$totalRows_Recordset1 = mysql_num_rows($Recordset1);
?>
            <label>
            <select name="select">
              <?php
do {  
?>
              <option value="<?php echo $row_Recordset1['identifiant']?>"<?php if (!(strcmp($row_Recordset1['identifiant'], $row_Recordset1['identifiant']))) {echo "selected=\"selected\"";} ?>><?php echo $row_Recordset1['identifiant']?></option>
              <?php
} while ($row_Recordset1 = mysql_fetch_assoc($Recordset1));
  $rows = mysql_num_rows($Recordset1);
  if($rows > 0) {
      mysql_data_seek($Recordset1, 0);
	  $row_Recordset1 = mysql_fetch_assoc($Recordset1);
  }
?>
            </select>
            </label>
    <?php
mysql_free_result($Recordset1);
?></div>
 
     Produit :  <select name="refp">
     <option value="">Choisir</option>
     <?php
 
foreach($aProdNotSelected as $k=>$v) 
{  
?>
     <option value="<?php echo $v; ?>"> <?php echo $v; ?> </option>
     <?php
}
?>
   </select>
   Quantit&eacute; : <input type="text" name="qte" size="3"/>
   <input type="button" name="add" value="Ajouter" onclick="javascript:document.prod.submit();"/> 
 
  <p><div id="Layer14"> 
    <table width="1209" height="54" border="1">
    <tr>
      <td width="185"><strong>Reference</strong></td>
      <td width="487"><strong>Designation</strong></td>
      <td width="126"><strong>Quantite</strong></td>
      <td width="135"><strong>Prix Unitaire </strong></td>
      <td width="125"><strong>Montant</strong></td>
    </tr>
  </table>
</td>
 
 
<?php
mysql_free_result($iRes);
 
if(isset($aSelectedProd)) 
 {
 foreach($aSelectedProd as $k=>$v)
 {
 $Sqlp     = "SELECT * FROM produit WHERE ref ='".$k."' " ;
 $ress     = mysql_query($Sqlp);
 $data     = mysql_fetch_assoc($ress);
$Sommetotal = 0;
$Sommetotal += $data['prix_achat']*$v;
?>
    <label> </label>
    <table width="1208" border="1">
      <tr> 
        <td width="186"> <label></label> <strong><spacer /><?php echo $data['ref'];?></strong> 
          <br/>
        <td width="486" height="35"><strong><?php echo $data['nom'];?> 
          </strong></td>
        <td width="127" height="35"><strong><?php echo $v;?></strong></td>
        <td width="135" height="35"><strong><?php echo $data['prix_achat'];?></strong></td>
        <td width="124" height="35"><strong><?php echo $data['prix_achat']*$v;?></strong>
		<a href="Ajouter_facture.php?iDelProd=<?php echo $data['ref']; ?>">Enlever</a>
		</td>
      </tr>
    </table>
  	 <div align="right">
 
 
  	   <table width="244" border="1">
  	     <tr>
  	       <td>Total H.T:<?php echo $Sommetotal;?> </td>
        </tr>
       </table>
  	   <table width="242" border="1">
  	     <tr>
  	       <td>Total T.V.A: </td>
        </tr>
       </table>
  	   <table width="242" border="1">
  	     <tr>
  	       <td>Total T.T.C: </td>
        </tr>
       </table>  	   <?php 
}
}
?>
    </div>
    <p align="center">&nbsp;</p>
    <p align="center">&nbsp;</p>
    <p align="center">
      <input type="submit" name="valider" value="Valider" />
      <input type="submit" name="reset" value="R&eacute;initialiser" />
    </p>
  </div>
  </p>
  <p>&nbsp;</p>
  <p>&nbsp;</p>
<p>&nbsp;</p>
  </form>
 
</body>
</html>