Probléme avec ma BDD

<?php
include("afficher.func.php");


// On se connecte à MySQL
$bdd = new PDO('mysql:host=localhost;dbname=blog;charset=utf8', 'root', '');
// Si tout va bien, on peut continuer



if(isset($_POST['submit']))
{

$nom = htmlspecialchars(trim($_POST['nom']));
$article = htmlspecialchars(trim($_POST['article']));

	if(empty($nom) || empty($article))
	{
		echo "Veuillez completer tous les champs";
	}else {
		inserer_article($nom,$article);
		}
}
?>

<form method="post">

<label for="nom">Votre nom:</label><br>
<input type="text" name="nom" /><br>

<label for="article">Votre article</label><br>
<textarea name="article" cols="20" rows="7"></textarea><br><br>

<input type="submit" name="submit" value="poster" />

</form>

<?php

function inserer_article($nom,$article)
{
$bdd = new PDO('mysql:host=localhost;dbname=blog;charset=utf8', 'root', '');
$req = $bdd->prepare('INSERT INTO articles(nom, article) VALUES(:pseudo :corps)');
	$req->execute(array(
	'pseudo' => $nom,
	'corps' => $article,
	));	
}
?>