Hi everybody I am trying to retrieve data from a multiple select and using PHP. Here is the code creating the select list and populating it with information from a MySQL database:

<select title="Basic example" multiple="multiple" name="id_categorie[]" size="3">
<?php
  include_once('../../modeles/class_Categorie.php');
  include_once '../../core/connx.php';
      foreach(Categorie::getAllCategorie()as $cat ){
      $categorie= new Categorie($cat->ID_CAT);
      echo 'getIDCategorie().'">'.$categorie->getNomCategorie().'';
  }
  ?>
</select> 

The form sends the value using POST method to the URL addArticle.php where I try to use the implode() statement:

<?php 
  include_once '../core/connx.php';
  include_once('../modeles/class_Article.php');
  include_once('../modeles/class_Image.php');
  include_once '../modeles/class.upload.php';
  $id=Article::creatArticle(0,$_POST['title'],implode(', ', $_POST['id_categorie']),$_POST['article']);
  insertionImage($id,'img1');
  function insertionImage($id,$img){
    $obj_img = new upload('../views/img/file/', $img);
  
    $obj_img->cl_taille_maxi = 1048579900000;
    $obj_img->cl_extensions = array('.gif','.jpg','.png','.jpeg'); // on attribut les extensions autorisées 
    $obj_img->cl_nb_char_aleatoire = 15;
    if (!$obj_img->uploadFichier('aleatoire')){
        $erreur=$obj_img->affichageErreur();
  
    }
    else {
      $chemin=$obj_img->cGetNameFileFinal();
      Image::addImage($id,$chemin);
  
    }
  }
  
  ?>

And the function that adds the article class Article:

**
 * function créeArticle
 */
public static function creatArticle($id_article,$title,$id_categorie,$article)
{
    global $db;

    $req = $db->prepare("INSERT INTO blog (ID_BLOG,TITLE,ID_CAT, ARTICLE,DATE) VALUES ('',:title,:id_categorie,:article,'".date('Y-m-d')."')");
    $ok = $req->execute(Array('title' =>$title,'id_categorie' => $id_categorie,'article' => $article));
     return $db->lastInsertId();
    //$erreur = $req->errorInfo();
}

The problem is when I select multiple values, I only get the first selected option from the form. How can I get all selected values !? Thanx