supprimer_annonce.php

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Bootstrap Example</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>

<div class="container">
  <h2>Recherche Annonce</h2>
  <form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post">

      <br>
      <div class="form-group">
      <label for="ville">Catégorie :</label>
      <label class="radio-inline">
      <input type="radio" name="categorie" value="auto">Automobile
    </label>
    <label class="radio-inline">
      <input type="radio" name="categorie" value="info">Informatique
    </label>
    <label class="radio-inline">
      <input type="radio" name="categorie" value="divers">Divers
    </label>
    </div>
    <button type="submit" class="btn btn-default" name="btn_chercher">Chercher</button>
    <button type="reset" class="btn btn-default" name="btn_annuler"/>Annuler</button>
  </form>
</div>
<?php
if(isset($_POST['btn_chercher'])):
    include_once('../lib/annonce.class.php');
    $annonce=new annonce();

    extract($_POST);
    $annonce->categorie=$categorie;
    if($donnees=$annonce->deleteAnnonce()) echo 'Supprimer avec succes';
    else echo 'Nope';
endif;
?>
</body>
</html>