Array won't print row data - php

Question

I got this simple PHP code to print a Column from a database and it isn't working unfortually. Any ideas on what to do right?
I've tried to work on the while loop I have in the if statement but no luck
What im trying to get array to print like :
<?php
$input = $_POST['input'];
$servername = "localhost";
$username = "hawk_manager";
$password = "hawk_eyes";
try {
$pdo = new PDO("mysql:host=$servername;dbname=HawkCenter", $username, $password);
// set the PDO error mode to exception
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
} catch(PDOException $e) {
echo "Connection failed: " . $e->getMessage();
}
if ($input == "RoomNumber") {
$query = 'SELECT RoomNumber FROM rooms';
$statement=$pdo->prepare($query);
$statement->execute();
$roomnumbers=$statement->fetchAll(PDO::FETCH_ASSOC);
$statement->closeCursor();
while( $roomnumbers=$statement->fetchAll(PDO::FETCH_ASSOC)){
echo "{$statement['RoomNumber']}";
}
}
$conn = null;
?>

Answer 1

You are doing it wrong, it should be
1. Selecting multiple rows
$data = $pdo->query("SELECT RoomNumber FROM rooms")->fetchAll(PDO::FETCH_ASSOC);
foreach ($data as $row) {
echo $row['RoomNumber ']."<br />\n";
}
2. Prepared Statements::
$stmt = $pdo->prepare("SELECT RoomNumber FROM rooms WHERE id=?");
$stmt->execute([$id]);
$user = $stmt->fetch();
OR
$stmt = $pdo->prepare("$stmt = $pdo->prepare("SELECT RoomNumber FROM rooms LIMIT :limit, :offset");
$stmt->execute(['limit' => $limit, 'offset' => $offset]);
$data = $stmt->fetchAll();
foreach ($data as $row) {
echo $row['RoomNumber']."<br />\n";
}