Ve 100 haber sitesi için manuel olarak tek tek eklemek yerine veritabani kullanabilirsin
Örnek:
id:site_name:rss_url
-------------------------
$conn = mysqli_connect("host", "username", "password", "dbname");

$sql = "SELECT id, site_name, rss_url FROM news_sites";
$result = mysqli_query($conn, $sql);

while($row = mysqli_fetch_assoc($result)) {
$site_id = $row['id'];
$site_name = $row['site_name'];
$rss_url = $row['rss_url'];

$feed = new SimplePie();
$feed->set_feed_url($rss_url);
$feed->init();
$feed->handle_content_type();

foreach ($feed->get_items() as $item) {
$title = $item->get_title();
$link = $item->get_link();
$description = $item->get_description();

if (strpos($title, 'aradığınız kelime') !== false) {
echo $site_name . ' - ' . $title . '<br>';
echo $link . '<br>';
echo $description . '<br>';
}
}
}

mysqli_close($conn);