Du coup j'ai corrigé pour quelque chose qui fonctionne à part que ça m'insère 2 fois la news qui est consulté dans la table :

$id_news = $_GET['id'];
    $visitIpQuery = $bdd->prepare("SELECT ip FROM visite_news WHERE id_news = :id AND ip='".$_SERVER['REMOTE_ADDR']."'");
    $visitIpQuery->bindValue(':id',$_GET['id'],PDO::PARAM_INT);
    if (!$visitIpQuery->execute()) {
        echo 'ERREUR';
        exit; //pas obligatoire
    }
    $visiteur = $visitIpQuery->fetch();
	$visitIpQuery->closeCursor;
if($visitIpQuery->rowCount() == 0) {
$req = $bdd->prepare('INSERT INTO visite_news(id_news, ip, date) VALUES(:id_news, :ip, :date)');
$req->execute(array(
	'id_news' => $id_news,
	'ip' => $_SERVER['REMOTE_ADDR'],
	'date' => date('d\-n\-Y')
    ));
}

$id_news = $_GET['id'];
    $visitIpQuery = $bdd->prepare("SELECT ip FROM visite_news WHERE id_news = :id AND ip='".$_SERVER['REMOTE_ADDR']."'");
    $visitIpQuery->bindValue(':id',$_GET['id'],PDO::PARAM_INT);
    if (!$visitIpQuery->execute()) {
        echo 'ERREUR';
        exit; //pas obligatoire
    }
    $visiteur = $visitIpQuery->fetch();
	$visitIpQuery->closeCursor;
if($visitIpQuery->rowCount() == 0) {
$req = $bdd->prepare('INSERT INTO visite_news(id_news, ip, date) VALUES(:id_film, :ip, :date)');
$req->execute(array(
	'id_news' => $id_news,
	'ip' => $_SERVER['REMOTE_ADDR'],
	'date' => date('d\-n\-Y')
    ));
}

$id_news = $_GET['id'];
$visitIpQuery = $bdd->query("SELECT ip FROM visite_news WHERE id_news=$id_news AND ip='".$_SERVER['REMOTE_ADDR']."'");
$visitIp = $visitIpQuery->fetch();
if($visitIpQuery->rowCount() == 0) {
	$bdd->query("INSERT INTO visite_news VALUE('', $id_news, '".$_SERVER['REMOTE_ADDR']."','".date('d\-n\-Y')."')");
	$newIpQuery = $bdd->query("SELECT * FROM visite_news WHERE ip='".$_SERVER['REMOTE_ADDR']."'");
}
?>

$id_news = $_GET['id'];
    $visitIpQuery = $bdd->prepare("SELECT ip FROM visite_news WHERE id_news = :id AND ip='".$_SERVER['REMOTE_ADDR']."'");
    $visitIpQuery->bindValue(':id',$_GET['id'],PDO::PARAM_INT);
    if (!$visitIpQuery->execute()) {
        echo 'ERREUR';
        exit; //pas obligatoire
    }
    $visiteur = $visitIpQuery->fetch();
    $visitIpQuery->closeCursor;
if($visitIpQuery->rowCount() == 0) {
    $stmt= $bdd->prepare("INSERT INTO visite_news (id_news, ip, date) VALUES (?, ?, ?)");
    $stmt->bindParam(1, $id_news);
    $stmt->bindParam(2, $ip);
    $stmt->bindParam(3, $date);
    // insertion d'une ligne
    $id_news = $_GET['id'];
    $value = 1;
    $stmt->execute();
    // insertion d'une autre ligne avec différentes valeurs
    $ip = $_SERVER['REMOTE_ADDR'];
    $value = 2;
    $stmt->execute();
    // insertion d'une autre ligne avec différentes valeurs
    $date = date('d\-n\-Y');
    $value = 3;
    $stmt->execute();
?>

<?php
    $stmt = $bdd->prepare("SELECT id, titre, posteur, resume, img, contenu, DATE_FORMAT(date, '%d/%m/%Y') AS date, active FROM news WHERE active=1 AND id = :id");
    $stmt->bindValue(':id',$_GET['id'],PDO::PARAM_INT);
    if (!$stmt->execute()) {
        echo 'ERREUR';
        exit; //pas obligatoire
    }
?>

<?php
$stmt = $dbh->prepare("SELECT * FROM REGISTRY where name = ?");
if ($stmt->execute(array($_GET['name']))) {
  while ($row = $stmt->fetch()) {
    print_r($row);
  }
}
?>

<?php
$getNewsQuery = $bdd->query("SELECT id, titre, posteur, resume, img, contenu, DATE_FORMAT(date, '%d/%m/%Y') AS date, active FROM `news` WHERE active=1 AND id=".$_GET['id']);
$getNews = $getNewsQuery->fetch();
?>

<?php
$stmt = $bdd->prepare(" id, titre, posteur, resume, img, contenu, DATE_FORMAT(date, '%d/%m/%Y') AS date, active FROM `news` WHERE active=1 AND id=".$_GET['id']);
if ($stmt->execute(array($_GET['id']))) {
  while ($row = $stmt->fetch()) {
    print_r($row);
  }
}
?>

On me parle souvent de requête préparé, tu peux me donner un exemple stp car je ne vois pas trop ce que ça signifie.