Scalability Readiness Check

Analyze PHP code for patterns that prevent horizontal scaling, break in multi-instance deployments, or create single points of failure.

Detection Patterns

1. File-Based Sessions

<?php

declare(strict_types=1);

// BAD: Default file-based session storage
// php.ini: session.save_handler = files
session_start();
$_SESSION['user_id'] = $userId;
// Instance A stores session, Instance B cannot read it