[MySQL] Recuperer Id checkbox

Recuperer Id checkbox : rien n'affiche
sur mon page html une form

Code:

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SELECT * FROM listemodulereinscription where cne='".$cne."' AND `ETATMODULE` LIKE 'nv' AND IDSEMESTRE=1
$utilisateur = mysqli_fetch_array($rs1
<INPUT name='choix[]' type='checkbox' value='".$utilisateur["IDMODULE"]."' checked readonly=true  />

sur page de traitement :

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<?php 
session_start();
			if(!$_SESSION['candidat']){
			header('location:connect.php');
			}else
			{
				//conection:
				$link = mysqli_connect("127.0.0.1","**","**","**") or die("Error " . mysqli_error($link));
				//consultation:
				$cne=$_SESSION['candidat'];
				$choices="";
				foreach($_POST['choix'] as $choix)
				{
				$choices .= ", ".$choix;
				}
				$query1 = "update listemodulereinscription set status=1 where cne='".$cne."' and IDMODULE IN (.$choices.) " or die("Error in the consult.." . mysqli_error($link));
				//execute the query.
				$result1 = $link->query($query1);
 
			}			
			if($result1)
			{
				$query2 = "update compte_candidat set statut_SA=1 where cne='".$cne."' " or die("Error in the consult.." . mysqli_error($link));
				//execute the query.
				$result2 = $link->query($query2);
				header('Location: ../reinsc_SP.php');
			}else{
				header('Location: ../error.php');
			}
?>