AJAX/PHP/MYSQL

<?php 

if(!empty($_POST) && !empty($_POST['search'])) 
{ 
  extract($_POST); 
  $search = strip_tags($search); 
   
  try{ 
  $bdd = new PDO('mysql:host=localhost;dbname=mabdd', 'username', 'password') or die(print_r($bdd->errorInfo())); 
  $bdd->exec('SET NAMES utf8'); 
  } 
   
  catch(Exeption $e){ 
  die('Erreur:'.$e->getMessage()); 
  } 
   
  $req = $bdd->query("SELECT champ1_article, champ2_article,champ3_article FROM table_article WHERE champ1_article LIKE '%$search%' OR champ2_article OR champ3_article LIKE '%$search%' ORDER BY id_article"); 
   
  if($req->rowCount()>0) 
  { 
    while($data = $req->fetch(PDO::FETCH_OBJ)) 
    { 
      echo '<h2>'.$data->champ1_article.'</h2>'; 
      echo '<p>'.$data->champ2_article.'</p>'; 
      echo '<hr />'; 
    } 
  } 
  else 
  { 
    echo '<h2>Aucun resultat</h2>'; 
  } 
} 

else 
{ 
  echo '<h2>Aucun resultat</h2>'; 
} 

?>