Salut j'ai des petits soucis avec la suppression sur mon fichier php que voici :

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<script src="https://code.highcharts.com/highcharts.js"></script>
<script src="https://code.highcharts.com/modules/data.js"></script>
<script src="https://code.highcharts.com/modules/exporting.js"></script>
<script src="https://code.highcharts.com/modules/accessibility.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<meta charset="UTF-8">
<link rel="stylesheet" type="text/css" href="CSS.css" />
 
<?php
error_reporting(0);
$servername = 'secret';
$username = 'secret';
$password = 'secret';
$conn = new mysqli($servername, $username, $password);
$conn = new PDO("secret");
try{
  $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
}catch(PDOException $e){
  echo "Erreur : " . $e->getMessage();
}
 
if(isset($_POST['idc'])) {
  $idc = $_POST['idc'];
 
  $sup=$conn->prepare('DELETE FROM commentaire WHERE id = ?');
  $sup->execute(array($idc));
 
  echo "Commentaire supprimé";
}
 
$resultat = $conn->query("SELECT * FROM commentaire");
$result = $conn->query("SELECT * FROM commentaire");
 
if(isset($_POST['valider'])){
  $modif='UPDATE commentaire SET text =?, date =? WHERE id='.$_POST['idm'];
  $r=$conn->prepare($modif);
  $r->execute(array($_POST['textc'],$_POST['datec']));
}
 
$dated=$_POST['yearf'];
$datef=$_POST['yearl'];
 
$anneed = substr($dated, 0,4);
$anneef = substr($datef, 0,4);
$moisd= substr($dated, -4,2);
$moidf= substr($datef, -4,2);
$jourd= substr($dated, -2);
$jourf= substr($datef, -2);
 
$site=$_POST['contributeur'];
$token_auth = 'secret';
$urlpiwik_site = 'secret';
$urlpiwik_getname = 'secret';
 
$ida = curl_init();
curl_setopt($ida, CURLOPT_CAINFO, __dir__. DIRECTORY_SEPARATOR . 'cert.cer');
curl_setopt($ida, CURLOPT_URL, $urlpiwik_site);
curl_setopt($ida, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ida, CURLOPT_TIMEOUT, 50);
curl_setopt($ida, CURLOPT_CONNECTTIMEOUT, 5);
$iddata = curl_exec($ida);
$iddata = json_decode($iddata, true);
$info['site'] = $iddata;
curl_close($ida);
$na = curl_init();
curl_setopt($na, CURLOPT_CAINFO, __dir__. DIRECTORY_SEPARATOR . 'cert.cer');
curl_setopt($na, CURLOPT_URL, $urlpiwik_getname);
curl_setopt($na, CURLOPT_RETURNTRANSFER, true);
curl_setopt($na, CURLOPT_TIMEOUT, 50);
curl_setopt($na, CURLOPT_CONNECTTIMEOUT, 50);
$namedata = curl_exec($na);
$namedata = json_decode($namedata, true);
$info['getname'] = $namedata;
 
$list_annee = range(2017, date("Y"));
$list_annee = array_reverse($list_annee);
$list_contributeur = array();
$randomn=0;
while(count($iddata)>$randomn)
{
  $list_contributeur[] = $iddata[$randomn];
  $randomn=$randomn+1;
}
$list_option_contributeur = '';
$i = 0;
foreach ($list_contributeur as $contributeur){
  $list_option_contributeur .= '<option  value='.$contributeur .'>'.($namedata[$contributeur]['name']);
  $i++;
}
 
$l=0;
 
$list_option_annee = '';
foreach ($list_annee as $an) {
  $list_option_annee .= '<input name=year['.$l.'] type="date" value="'.$an.'">'.$an.'</option >' . "\n";
  $l++;
}
?>
<script language="javascript">
function toutcocher()
{
  for(i=0;i<document.F1.length;i++)
  {
    if(document.F1.elements[i].type=="checkbox")
    document.F1.elements[i].checked=true;
  }
}
</script>
 
<?php
$output ='<a class="h3Suivant">Sélection personnalisée (multiple fonctionnel)</a>
<div class="h3Suivant">
<form name="F1" action="" method="POST">
<select name="contributeur[]" multiple >
<option value=0 >Sites</option>
'.$list_option_contributeur.'
</select>
Début : <input name="yearf" type="date" min="2017-01-01" ></input> *Fin :
<input name="yearl" type="date" min="'.$dated.'"></input>
<input type="submit" value="Chercher">
<button><a href="index.php">RETOUR</a></button>
</form>
</div>';
 
echo $output;
 
$iddiv=0;
$annot = [];
$vidata =[];
$yvdata =[];
$myDate = date('Y/m/d');
 
if(empty($site)){
  $site = $list_contributeur;
}
foreach ($site as $s){
  while($ligne=$result->fetch(PDO::FETCH_OBJ)){
      //affiche le tableau selon la selection du bouton Modifier
      $mod='modifier'.$ligne->id;
 
      if(isset($_POST[$mod])){?>
        <form method="POST" action="">
          <table id="datatable<?php echo $iddiv;?>" class="datatable">
            <?php $iddiv++; ?>
            <thead>
              <th colspan="4"> Modification</th>
            </thead>
            <tr>
              <th> DATE(S) </th>
              <th colspan="2">COMMENTAIRE(S)</th>
            </tr>
 
            <tbody>
              <?php
              $res = $conn->query("SELECT * FROM commentaire where id=".$ligne->id);
              while($lg=$res->fetch(PDO::FETCH_OBJ)){
                ?>
                <tr>
                  <input name="idm" type="hidden" value="<?php echo $lg->id;?>" />
                  <th><input type="date" name="datec" value="<?php echo $lg->date; ?>" required></th>
                  <th><input type="textarea" name="textc" value="<?php echo $lg->text; ?>"  maxlength="90000000" required></th>
                  <th><input type="submit" name="valider" value="Valider" ></th>
                </tr>
                <?php
              } ?>
            </tbody>
          </table>
          <?php
        }
 
 
  }  ?>
  </form>
  <?php
  $iddiv++;
 
  $sth= $conn->prepare("
  SELECT * FROM commentaire WHERE idSite = ? AND date BETWEEN ? AND ?
  ");
  $sth->execute(array($s,$dated,$datef));
 
  if(empty($datef)){
    $sth= $conn->prepare("SELECT * FROM commentaire WHERE idSite = ? AND date > ? ");
    $sth->execute(array($s,$dated));
  }
 
  if(empty($dated)&&(empty($datef))){
    $datef=date('Y/m/d');
    $sth= $conn->prepare("SELECT * FROM commentaire WHERE idSite = ? AND date BETWEEN 2017-01-01 and ? ");
    $sth->execute(array($s,$datef));
  }
  if(empty($dated)){
    $sth= $conn->prepare("SELECT * FROM commentaire WHERE idSite = ? AND date < ? ");
    $sth->execute(array($s,$datef));
  }
  ;
  if(isset($_POST['valider'])){
    $modif='UPDATE commentaire SET text =?, date =? WHERE id='.$_POST['idm'];
    $r=$conn->prepare($modif);
    $r->execute(array($_POST['textc'],$_POST['datec']));
  }?>
  <form method="POST" action="">
    <table id="datatable<?php echo $iddiv;?>" class="datatable">
      <?php $iddiv++; ?>
      <thead>
        <th colspan="4"><?php echo $namedata[$s]['name'];?></th>
      </thead>
 
      <tr>
        <th> DATE(S) </th>
        <th> COMMENTAIRE(S) </th>
        <th> ACTION </th>
      </tr>
      <tbody>
        <?php
        while ($don = $sth->fetch())
        {
          setlocale(LC_TIME, "fr_FR", "French");
          $datelettre=utf8_encode(strftime("%A %d %B %G", strtotime($don['date'])));
          $idcommentaire=$don['id'];
          $idsite=$don['idSite'];
          //if(empty($don['id']))
          ?>
 
          <tr>
            <th><?php echo $datelettre ; ?>
            </th>
            <td><?php echo $don['text']; ?>
            </td>
            <td>
              <a href='lecture.php?idc=<?php echo $don['id']; ?>'>Supprimer</a> </br>
              <input type="submit" name="<?php echo 'modifier'.$don['id'];?>" value="Modifier" >
            </td>
 
        </tr>
 
      <?php
      $sth->closeCursor();
      ?>
    </tbody>
    <?php
  } ?>
  <th colspan="4"><a href="ecriture.php?contributeur[]=<?php echo $s; ?>" >Ajouter</a></th>
  </table>
</form> <?php
 
 
 
}
Voilà pour etre plus précis lorsque je clique sur le bouton "supprimer" du commentaire n°95 (par exemple) on obtient "idc=95" dans l'url et pourtant le commentaire n'est pas supprimé.

Quelqu'un à une idée ?
Merci d'avance ?