Cascading Failure Detection

Analyze PHP code for patterns that can cause cascading failures across services and components.

Detection Patterns

1. Shared Resource Without Isolation

// CRITICAL: Single connection pool shared by all services
final class DatabasePool
{
    private static array $connections = [];

    public static function getConnection(): PDO
    {
        // All services compete for same pool
        // If one service hogs connections, all others starve
        return self::$connections[array_rand(self::$connections)];