Envoyer un JsonArray de JAVA Android vers PHP serveur et faire des update mysql

bonjour ,
je veux envoyer un Array de JAVA (Android) vers PHP ( serveur ) à l'aide de JSONArray .
j'ai trouvé nombreux tutoriel mais ça marche pas, je sais pas pourquoi
surement je fais une erreur du coté php,
j'ai trouvé cette solution mais il parle pas du coté php
voila mon code :

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JSONObject jobj = null;
            JSONArray jArray = new JSONArray();
            while (cursor.moveToNext())
            {
                String minute=cursor.getString(1);
                String j1=cursor.getString(2);
                String j2=cursor.getString(3);
               //.....
                try {
 
 
                    jobj.put("j1", j1);
                    jobj.put("j2", j2);
                    //......
                    jobj.put("userid",id);
                   // Log.i("json sync",jobj.toString());
 
                    jArray.put(jobj);
 
                } catch (JSONException e) {
                e.printStackTrace();
            }
            }
            cursor.close();
 
            Log.i("json array",jArray.toString());
 
 
 
                InputStream is = null;
                String result = null;
                int TIMEOUT_MILLISEC=30000;
 
                // Envoie de la commande http
                try {
                    HttpClient client = new DefaultHttpClient();
                    HttpConnectionParams.setConnectionTimeout(client.getParams(), 10000); //Timeout Limit
                    HttpResponse response;
                    JSONObject json = new JSONObject();
 
                    String url = "http://exemple.php";
 
                    HttpPost post = new HttpPost(url);
 
                    StringEntity se = new StringEntity( jArray.toString());
                    se.setContentType(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));
                    post.setEntity(se);
                    response = client.execute(post);
                    HttpEntity entity = response.getEntity();
                    is = entity.getContent();
                    BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"), 8);
                    StringBuilder sb = new StringBuilder();
                    String line = null;
 
                    while ((line = reader.readLine()) != null) {
                        sb.append(line + "\n");
                    }
                    result = sb.toString();
                    is.close();
 
                    Log.i("test ", result.toString());
 
                } catch (Exception e) {
                    Log.e("log_tag", "Error in http connection " + e.toString());
                }

php code :

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$json = file_get_contents('php://input');
$obj = json_decode($json);
$output=$obj;
while ($val=$obj->fetch())
{
 
    $heure = $val["minute"];
 
    $id_client =$val['userid'];            
    $req = $bdd->exec( //... 
//........
}                        
 print(json_encode($output,JSON_UNESCAPED_UNICODE));
mysql_close();

Edition 1:

j'ai trouvé l'erreur c'était dans la boucle while ... je l'ai remplacé par foreach

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$json = file_get_contents('php://input');
$obj = json_decode($json);
 
 
 
foreach($obj as $adresse){ 
 
        $heure = $adresse -> {"minute"}; 
        $id_client = $adresse -> {"userid"};
        $j1 = $adresse -> {"j1"};
        $j2 = $adresse -> {"j2"};
        $j3 = $adresse -> {"j3"};
        $j4 = $adresse -> {"j4"};
        $j5 = $adresse -> {"j5"};
        $j6 = $adresse -> {"j6"};
        $j7 = $adresse -> {"j7"};
 
 
 
  	$bdd->exec( 'UPDATE   planning1 SET   j1 = \'' . $j1 . '\' WHERE   (planning1.id_client = \'' . $id_client . '\') AND (planning1.minute ='.$heure.')');
	//$bdd->closeCursor();
    $output['j1']=true;
 
	$bdd->exec( 'UPDATE   planning1 SET   j2 = \'' . $j2 . '\' WHERE   (planning1.id_client = \'' . $id_client . '\') AND (planning1.minute = '.$heure.')');
    //$bdd->closeCursor();
    $output['j2']=true;
 
	$bdd->exec( 'UPDATE   planning1 SET   j3 = \'' . $j3 . '\' WHERE   (planning1.id_client = \'' . $id_client . '\') AND (planning1.minute = '.$heure.')');
    //$bdd->closeCursor(); 
    $output['j3']=true;
 
	$bdd->exec( 'UPDATE   planning1 SET   j4 = \'' . $j4 . '\' WHERE   (planning1.id_client = \'' . $id_client . '\') AND (planning1.minute = '.$heure.')');
    //$bdd->closeCursor();
    $output['j4']=true;
 
	$bdd->exec( 'UPDATE   planning1 SET   j5 = \'' . $j5 . '\' WHERE   (planning1.id_client = \'' . $id_client . '\') AND (planning1.minute = '.$heure.')');
    //$bdd->closeCursor();
    $output['j5']=true;    
 
	$bdd->exec( 'UPDATE   planning1 SET   j6 = \'' . $j6 . '\' WHERE   (planning1.id_client = \'' . $id_client . '\') AND (planning1.minute = '.$heure.')');
    //$bdd->closeCursor();
    $output['j6']=true;
 
	$bdd->exec( 'UPDATE   planning1 SET   j7 = \'' . $j7 . '\' WHERE   (planning1.id_client = \'' . $id_client . '\') AND (planning1.minute = '.$heure.')');
    //$bdd->closeCursor();
    $output['j7']=true;
 
 
}

mais j'ai un autre probléme : l'execution des requetes se plante et l'erreur suivant s'affiche :

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The server encountered an internal error or
    misconfiguration and was unable to complete
    your request.<P>
    Please contact the server administrator to inform of the time the error occurred
    and of anything you might have done that may have
    caused the error.<P>
    More information about this error may be available
    in the server error log.<P>

Aidez moi SVP :(