Php/pg_admin: pb de concaténation - INSERT

$champmax=addchamp(1);
$champorigine=rows_cont();

<?	

$i=0;
	foreach($wctrl as $key=>$value)
	{  
		$i++;
		
?>	   
	   	
	   <TR>
	   <TD id="td<?=$i?>"> 
	   <input  type="text" id="idctrl<?=$i?>" name="controleur[<?=$i?>]" height="80" size="80%" maxlength="500" readonly  value="<?=$value?>">
	<input type="hidden" name="contnum[<?=$i?>]" value="<?=$key?>">
     
	</TD>
	<TD width="70" align="center">
	<a href="javascript:supcntrl(<?=$key?>,'<?=$value?>');"><img width="20" src="images/commun/delete_0.gif" onmouseover="javascript:btnimg(this,'_0','_1')" onmouseout="javascript:btnimg(this,'_1','_0')" ></a>&nbsp;
		   
	<a href="javascript:editchamp(<?=$i?>,<?=$key?>,'<?=$value?>');"><img width="20" src="images/commun/edit_0.gif" onmouseover="javascript:btnimg(this,'_0','_1')" onmouseout="javascript:btnimg(this,'_1','_0')" ></a>
	</TD>
		
	</TR>

<? } ?>	

//****************** traitement table controleurs ***************  
   
  $wctrl=array_combine($_POST['contnum'],$_POST['controleur']); 
   
   
   
  while (($wrecctrl=pg_fetch_assoc($rs)) and (!$werr)) 
  {    
  
   if($wctrl[$wrecctrl['contnum']]!=$wrecctrl['contnom']) 
   {  
     
    $sql="update controleurs set contnom='".$wctrl[$wrecctrl['contnum']]."' where contnum=".$wrecctrl['contnum']; 
     
    $result_query=pg_query($cn,$sql); 
    if ($result_query) 
    { 
     $nb_ligne=pg_affected_rows($result_query); 
     if ($nb_ligne==1) 
     { 
       $mess="Modification effectuée avec succès"; 
      $wclass='messnorm'; 
     }  
     else 
     { 
      $mess="Aucune modification n'a été effectuée"; 
      $wclass='messerr'; 
      $werr=true; 
     } 
    } 
    else 
    { 
      $mess="Erreur ".pg_last_error($cn); 
     $wclass='messerr'; 
     $werr=true; 
    }   
   } 
  
   } 
    
   
  $champmax=addchamp(1); 
  $champorigine=rows_cont(); 
   
  if($champmax>$champorigine) 
  { 
    
    $sql="INSERT INTO controleurs (contnom,contpresta) VALUES (".$_POST["'controleur[".$champmax"]'"]"",".$_POST"[""'contnum[".$champmax"]']")" ; 
    $result_query=pg_query($cn,$sql); 
     
    if ($result_query) 
    { 
     $mess="Modification effectuée avec succès"; 
     $wclass='messnorm'; 
    } 
    else 
    { 
      $mess="Aucune modification n'a été effectuée"; 
     $wclass='messerr'; 
     $werr=true; 
    } 
     
  }  
   
}