<?php

declare(strict_types=1);

function isEmpty(array $array){
    foreach ($array as $value => $content) {
        if (empty($content)){
            return true;
        } else {
            return false;
        }
    }
}

function user_exists(object $pdo, string $username){
    if (username_search($pdo, $username)) {
        return true;
    } else {
        return false;
    }
}

function send_message(object $pdo, string $username, string $content) {
    function get_users_id(object $pdo, string $username){
        $user_id = retrieve_user_id($pdo, $username);
        return $user_id;
    }

    $users_id = get_users_id($pdo, $username);
    write_message($pdo, $username, $users_id, $content);
}

function print_errors(){
    check_errors();
}

function is_user_logged_in() {
    if (isset($_SESSION["username"])) {
        return true;
    } else {
        return false;
    }
}