<?php
// Database configuration
define('DB_HOST', '127.0.0.1');
define('DB_NAME', 'real_estate');
define('DB_USER', 'app_user');
define('DB_PASS', 'Secure@Password123');

/**
 * Establishes a database connection using PDO.
 * @return PDO A PDO database connection object.
 */
function db_connect() {
    try {
        $pdoconn = new PDO('mysql:host=' . DB_HOST . ';dbname=' . DB_NAME, DB_USER, DB_PASS);
        $pdoconn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
        return $pdoconn;
    } catch (PDOException $e) {
        // In a real app, you'd log this error and show a generic message
        die("Database connection failed: " . $e->getMessage());
    }
}

// You can now include this file and call db_connect() to get a database connection.