feelter

$user = 170;
$query->bind_param('ssi', $message, $date, $user);

$query = $database->prepare("INSERT INTO messages(message,date,id_user) VALUES(?, ?, 170)");

<?php
class Session
{

    protected function tryLoadSession()
    {
        if (empty($_SESSION)) {
            session_start();
        }
    }
    
    public function get($name)
    {
        $this->tryLoadSession();
        
        if (empty($_SESSION[$name])) {
            return null;
        }
        
        return $_SESSION[$name];
    }
    
    public function set($name, $value)
    {
        $this->tryLoadSession();
        
        $_SESSION[$name] = $value;
    }
}

$session = new Session;
$session->get('user_id');
$session->set('user_id', 100500);