db_connection.php

<?php
// db_connection.php

function getDBConnection()
{
    // We need the session for accessing $_SESSION['dbUser'] / $_SESSION['dbPass']
    // If the session is not started yet, start it:
    if (session_status() === PHP_SESSION_NONE) {
        session_start();
    }

    // Make sure the user is logged in (i.e., has credentials in session):
    if (!isset($_SESSION['dbUser'], $_SESSION['dbPass'])) {
        // If not, redirect or throw an exception
        header('Location: login.php');
        exit;
    }

    try {
        $pdo = new PDO(
            'mysql:host=localhost;dbname=Labirinto;charset=utf8mb4',
            $_SESSION['dbUser'],
            $_SESSION['dbPass'],
            [PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION]
        );
        return $pdo;
    } catch (PDOException $e) {
        // Handle or rethrow
        die("Database connection error: " . $e->getMessage());
    }
}