[PDO] la perte de la connection LDAP après un POST

slt voici mon code au début la connection marche très bien quand je utilise la méthode admin.lister et et poste une donnée la connections se perd
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<?php
 
 
$domain=$_POST["domain"];
$user=$_POST["user"];
$user=$user."@".$domain;
$pass=$_POST["pass"];
 
class user 
 
{var $nom;
var $adress;
var $prenom;
var $ocupation;
var$Fonction;         
var$Mail;              
var$Num; 
var$log;
 
/*function login($user,$pass)

{

    $_SESSION["log"]=0;
    $_SESSION["log"]++;
    $_SESSION["user"]=$user;
    $_SESSION["pass"]=$pass;
    return ($_SESSION["log"]);
}*/
 
 
 
function ldap_connect($domain)
 
{$ds = ldap_connect ($domain,"389") or die ("error");
 
 
return($ds);
}
 
function bind($ds,$user,$pass)
{
ldap_set_option($ds, LDAP_OPT_PROTOCOL_VERSION,3);
ldap_set_option($ds, LDAP_OPT_REFERRALS, 0);
$bd=ldap_bind($ds, $user, $pass);
 
return($bd);
}
function getdn($domain,$ds,$user)
{$dc=explode('.',$domain);
$user=explode("@",$user);
$dn="DC=".$dc[0].","."DC=".$dc[1];
$filtre="sAMAccountName=".$user[0];
$result=ldap_search($ds,$dn,$filtre);
 
$val=ldap_get_entries($ds, $result);
return($val[0]["dn"]);
}
 
function user($domain ,$ds,$user)
{$dc=explode('.',$domain);
$user=explode("@",$user);
$dn="DC=".$dc[0].","."DC=".$dc[1];
$filtre="sAMAccountName=".$user[0];
$result=ldap_search($ds,$dn,$filtre);
 
$val=ldap_get_entries($ds, $result);
 
$this->nom=($val[0]["name"][0]);
$a=($val[0]["name"][0]);
$this->log=($val[0]["samaccountname"][0]);
$this->prenom=($val[0]["givenname"][0]);
$this->function=($val[0]["description"][0]);
$this->adress=($val[0]["streetaddress"][0]);
$this->mail=($val[0]["mail"][0]);
$this->num=($val[0]["telephonenumber"][0]);
$name=($val[0]["samaccountname"][0]);
$_SESSION[$name]=$this;
//$_SESSION["objet"]=$this;
 
}
function nameofobjet($domain,$ds,$user)
{$dc=explode('.',$domain);
$user=explode("@",$user);
$dn="DC=".$dc[0].","."DC=".$dc[1];
$filtre="sAMAccountName=".$user[0];
$result=ldap_search($ds,$dn,$filtre);
$val=ldap_get_entries($ds, $result);
$nom=($val[0]["samaccountname"][0]);
return ($nom);
}
function lister($domain,$ds)
{$dc=explode('.',$domain);
$dn="DC=".$dc[0].","."DC=".$dc[1];
//echo($dn);
 
//$result=ldap_search($ds,"DC=essaie,DC=du","sAMAccountName=Administrateur");
//$result=ldap_search($ds,"DC=essaie,DC=du","objectClass=User");
$result=ldap_search($ds,$dn,"objectClass=User");
$val=ldap_get_entries($ds, $result);
 
 
 for ($i=0;$i<$val["count"];$i++)
 {?>
 
    <table border="2">
    <tr><td>nom user</td> <td>   <?php echo $val[$i]["name"][0]; ?> </td> </tr> 
    <tr><td>name of login </td> <td><?php echo $val[$i]["samaccountname"][0]; ?> </td> </tr>
    <tr><td>prenom user</td> <td><?php echo $val[$i]["givenname"][0]; ?> </td> </tr>
    <tr><td>Fonction</td> <td> <?php echo $val[$i]["description"][0]; ?></td> </tr>
    <tr><td>Mail</td> <td><?php echo $val[$i]["mail"][0]; ?> </td> </tr>
    <tr><td> numéro detéléphone</td> <td><?php echo $val[$i]["telephonenumber"][0];?> </td>   </tr>
 
 
 
 
  <table>
 
 
<?php
 
}
}
 
 
//function modobjectclass($domain,$ds,)
function getdes ($domain,$ds,$user)
{$dc=explode('.',$domain);
$user=explode("@",$user);
$dn="DC=".$dc[0].","."DC=".$dc[1];
$filtre="sAMAccountName=".$user[0];
$result=ldap_search($ds,$dn,$filtre);
$val=ldap_get_entries($ds, $result);
$nom=($val[0]["description"][0]);
return ($nom);
}
}
class admin extends user 
{
 function admin($domain ,$ds,$user)
{$dc=explode('.',$domain);
$user=explode("@",$user);
$dn="DC=".$dc[0].","."DC=".$dc[1];
$filtre="sAMAccountName=".$user[0];
$result=ldap_search($ds,$dn,$filtre);
 
$val=ldap_get_entries($ds, $result);
 
$this->nom=($val[0]["name"][0]);
$a=($val[0]["name"][0]);
$this->log=($val[0]["samaccountname"][0]);
$this->prenom=($val[0]["givenname"][0]);
$this->function=($val[0]["description"][0]);
$this->adress=($val[0]["streetaddress"][0]);
$this->mail=($val[0]["mail"][0]);
$this->num=($val[0]["telephonenumber"][0]);
$name=($val[0]["samaccountname"][0]);
$_SESSION[$name]=$this;
}
    function lister($domain,$ds,$user,$pass)
 
{$dc=explode('.',$domain);
$dn="DC=".$dc[0].","."DC=".$dc[1];
$user=$user;
$pass=$pass;
//echo($dn);
 
//$result=ldap_search($ds,"DC=essaie,DC=du","sAMAccountName=Administrateur");
//$result=ldap_search($ds,"DC=essaie,DC=du","objectClass=User");
$result=ldap_search($ds,$dn,"objectClass=User");
$val=ldap_get_entries($ds, $result);
 
 
 for ($i=0;$i<$val["count"];$i++)
 {?>
<form name="secu" action="<?php echo $_SERVER['PHP_SELF']; ?>" method="POST">
 
    <table border="2">
    <tr><td>nom user</td> <td> <?php echo $val[$i]["name"][0]; ?> </td> </tr> 
    <tr><td>name of login </td> <td> <input type="text" name="log" value="<?php echo $val[$i]["name"][0]; ?> "</td> </tr>
    <tr><td>prenom user</td> <td><?php echo $val[$i]["givenname"][0]; ?> </td> </tr>
    <tr><td>Fonction</td> <td> <?php echo $val[$i]["description"][0]; ?></td> </tr>
    <tr><td> mail </td> <td><?php echo $val[$i]["mail"][0]; ?> </td> </tr>
    <tr><td> numéro detéléphone</td> <td><?php echo $val[$i]["telephonenumber"][0];?> </td>   </tr>
    <tr><td> privilege </td> <td> <input type="radio" name="y" value="oui" checked="checked" /> 
<tr><td> <input type="radio" name="n" value="non" /> </td> </tr>
  <tr><td><input type="hidden"; name="val" value="<?php echo($val[$i]["samaccountname"][0]); ?>" /></td></tr> 
 <tr><td> modifie </td>  <td> <input name="mod" value="modfier" type="submit" /> </td></tr> 
  <tr><td>  <input name="user" type="hidden" value="<?php echo($user);?> "/></td></tr> 
 <tr><td>  <input name="domain" type="hidden" value="<?php echo($domain);?> "/></td></tr> 
   <tr><td>  <input name="pass" type="hidden" value="<?php echo($pass);?> "/></td></tr> 
 
 
 
 
 
 
 <br>
 
  <table>
 
</form>
<?php
 
}
 
 
 
}
function mod($ds,$dn,$user,$val)
 
{$tab=array();
$tab["description"]=$val."useowxy";
ldap_mod_replace($ds,$dn,$tab);
}
}
session_name("ldap");session_start();
$ds=user::ldap_connect($domain,"389")or die ("erreur");
 
$e=user::bind($ds,$user,$pass);
//if ($e==0){ header("HTTP/1.0 404 Not Found");
 //exit();}
$dn=user::getdn($domain,$ds,$user);
//echo($dn);
 
/*$entry=array();
$entry["unicodepwd"]="aa";
$dn=user::getdn($domain,$ds,$user);
echo($dn);
$dn="CN=lmd,CN=Users,DC=essaie,DC=du";
$ne="CN=Admin";
$newp="CN=Users,objectclass=delatlog ,DC=essaie,DC=du";
$bool=1;
$mod=ldap_rename($ds,$dn,$ne,$newp,$bool);
var_dump($mod);
echo("yes");
echo($mod);
//echo($dn);*/
if($e==1)
{
    if (($user=Administrateur) or ($user=administrateur))
{$_SESSION["domain"]=$domain;
 $_SESSION["ds"]=$ds;
 
 $dn=user::getdn($domain,$ds,$user);
 $_SESSION["dn"]=$dn;
 $a=user::nameofobjet($domain,$ds,$user);
 $_SESSION["id"]=$a;
 
 $$a=new user($domain,$ds,$user);
 $$a=new admin($domain,$ds,$user);
 //echo($_SESSION[$_SESSION["id"]]->log) ;//var_dump($_SESSION);
 $val=$$a->getdes($domain,$ds,$user);
 
$$a->lister($domain,$ds,$user,$pass);
 
//$l=ldap_unbind($ds);
echo($l);
 
}
 
}
if (isset($_POST["mod"])) {$$a->mod($ds,$dn,$user,$val);}
?>