<?php

declare(strict_types=1);

function retrieve_chat_history(object $pdo){
    $query = "SELECT username, content, date_sent FROM comments;";

    $stmt = $pdo->prepare($query);
    $stmt->execute();
    $chat_history = $stmt->fetchAll(PDO::FETCH_ASSOC);

    $stmt = null;
    $query = null;

    return $chat_history;
}