Generer automatiquement le numéro

 <?php
include_once('secure.php');
//Paramettre mmail
$Destinataire = "news@cybernet.cd";
$Sujet = "Nouveau Ticket enregistré";
$From  = "From:news@cybernet.cd\n";
$From .= "MIME-version: 1.0\n";
$From .= "Content-type: text/html; charset= iso-8859-1\n";
$Message = "Dear, <p>Un nouveau ticket vient d'etre créé dont voici les details : </p><p>Numero du ticket : $ticketnumber</p><p>Client : $customer_name</p><p>Type de Plainte : $plainte_type</p><p>Ticket créé par : $by</p><p>Date et heure : $date</p><p>Commentaire :$comment</p>";

//genère le numero de ticket
$nb_min = 1;
$nb_max = 100000;
$nombre = mt_rand ($nb_min,$nb_max);
 //genère le numero de ticket
?>

 <?php
    if (isset($_POST['Soumettre']) && $_POST['Soumettre'] == 'Soumettre') {
	extract($_POST);
         if (isset($_POST['customer_name']) && !empty($_POST['customer_name']))  {
           $erreur = 'Le nom du client est vide.';
        }
		if (isset($_POST['by']) && !empty($_POST['by']))  {
           $erreur = 'Vous devriez indiquer votre nom pour suivi.';
        }
             $sql = 'INSERT INTO 'ticket'('ticketnumber','customer_name', 'by', 'plainte_type', 'comment', 'date') VALUES ("'.mysql_escape_string($_POST['ticketnumber']).'","'.mysql_escape_string($_POST['customer_name']).'","'.mysql_escape_string($_POST['by']).'", "'.mysql_escape_string($_POST['plainte_type']).'","'.mysql_escape_string($_POST['comment']).'", "'.date('Y-m-d H:i:s').'")';
                mysql_query($sql) or die('Erreur SQL !'.$sql.'<br />'.mysql_error());
				
 if ( mail( $Destinataire,$Sujet,$Message,$From) ) // tentative d'envoi du message  
            {  
                $mailSent = true;  
            }  
		else // échec de l'envoi  
            {  
                $errors[] = 'Erreur d\'envoie de mail.';  
            }  
                echo '<div id="info" class="succes">Ticket enregistré</br></div>';
                exit();
             }
    ?>

<div id="boxAgent">
<form action="" method="post" name="form1" id="form1">
          <table>
 <?php
 // échec de l'envoi
   if (isset($erreur)) {
   echo '<div id="info" class="error">'.$erreur.'</div><!--error-->';
     } ?>
     <br/><br/><h3>Nouveau Ticket</h3> 
  <tr>
              <td>Numero du Ticket</td>
              <td >
                <input type="text" name="ticketnumber"  class="input_ajout_agent" value="TK<?php echo $nombre; ?>" /><!--- affiche le  numero de ticket-->
				 </td> 
            </tr>
            <tr>
              <td class="td">Customer Name</td>
              <td> 
			 <?php
			 $query = "SELECT 'username' FROM 'wimax_site'";
			 $result = mysql_query($query);
			 echo '<SELECT  name="customer_name"  class="input_ajout_agent" value="<?php if (isset($_POST["customer_name"])) echo htmlentities(trim($_POST["customer_name"])); ?>">';
			echo '<OPTION>Choisissez le client</OPTION>';
			while ($row = mysql_fetch_array($result)) {
			 echo '<OPTION>'.$row['username'].'</OPTION>';
			 }
			 echo '</SELECT>';
			 ?>
			  </td>
            </tr>

            <tr>
              <td>Ticket créé par</td>
              <td >
                <input type="text" name="by"  class="input_ajout_agent" value="<?php echo htmlentities(trim($_SESSION['nom'])); ?>" />
				 </td> 
            </tr>

             <tr>
              <td>Concerne/Plainte</td>
              <td>
			  <select type="text" name="plainte_type" class="input_ajout_agent">
			<option>Choisissez</option>
			<option value="Manque de connexion">Pas d'accès internet</option>
			  <option value="Desinstallation">Desinstallation</option>  
			  <option value="Installation">Installation</option> 
			  <option value="Lenteur">Lenteur</option>
			  <option value="Reactivation">Reactivation</option> 
			  <option value="Mise en test">Mise en test</option>
			  <option value="Mise en test">Mail</option>
			  <option value="Changement de service">Changement de service</option>
			  <option value="Autres">Autres</option>
			  </select>
			</td>
            </tr>

              <tr>
               <td>Detail/Commentaire</td>
              <td >
                  <textarea type="text" name="comment"  class="input_ajout_agent" value="<?php if (isset($_POST['comment'])) echo htmlentities(trim($_POST['comment'])); ?>" ></textarea></td>
            </tr>

            <tr>
                         <td></td>
                         <td><input type="submit" name="Soumettre" class="submi" value="Soumettre" /></td>
            </tr>
			</table>

</form></div>

Notice: Undefined variable: ticketnumber in C:\wamp\www\wimaxcustomer\ticket.php on line 9

Notice: Undefined variable: customer_name in C:\wamp\www\wimaxcustomer\ticket.php on line 9

Notice: Undefined variable: plainte_type in C:\wamp\www\wimaxcustomer\ticket.php on line 9

Notice: Undefined variable: by in C:\wamp\www\wimaxcustomer\ticket.php on line 9

Notice: Undefined variable: date in C:\wamp\www\wimaxcustomer\ticket.php on line 9

Notice: Undefined variable: comment in C:\wamp\www\wimaxcustomer\ticket.php on line 9

/Paramettre mmail
$Destinataire = "news@cybernet.cd";
$Sujet = "Nouveau Ticket enregistré";
$From  = "From:news@cybernet.cd\n";
$From .= "MIME-version: 1.0\n";
$From .= "Content-type: text/html; charset= iso-8859-1\n";
$ticketnumber ="";
$customer_name="";
$plainte_type="";
$by="";
$date="";
$comment="";
$Message = "Dear, <p>Un nouveau ticket vient d'etre créé dont voici les details : </p><p>Numero du ticket : $ticketnumber</p><p>Client : $customer_name</p><p>Type de Plainte : $plainte_type</p><p>Ticket créé par : $by</p><p>Date et heure : $date</p><p>Commentaire :$comment</p>";