# ultrasamad/shopping-cart architecture

> Architecture diagram of the GitHub repository ultrasamad/shopping-cart, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-11-10). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/ultrasamad/shopping-cart
- Repository: https://github.com/ultrasamad/shopping-cart

## Overview

This is a small PHP shopping-cart library. A caller creates a Cart with a storage implementation, then uses it to add, remove, update, list, count, total, or clear items. Cart delegates those operations through StorageInterface; SessionStorage implements that contract using PHP session state. The README describes the cart capabilities, while the sampled implementation shows the storage-backed constructor and delegation. The example application files are present but were not sampled, so their runtime wiring is omitted.

Main entry points: [`src/SessionStorage.php`](https://github.com/ultrasamad/shopping-cart/blob/main/src/SessionStorage.php) (Session storage), [`src/Cart.php`](https://github.com/ultrasamad/shopping-cart/blob/main/src/Cart.php) (Cart API), [`src/StorageInterface.php`](https://github.com/ultrasamad/shopping-cart/blob/main/src/StorageInterface.php) (Storage contract)

## Diagram (Mermaid)

```mermaid
flowchart TD

node_caller(("Application caller"))
node_cart["Cart API<br/>[Cart.php]"]
node_storage_contract["Storage contract"]
node_session_storage["Session storage<br/>[SessionStorage.php]"]
node_php_session[("PHP session state")]

node_caller -->|"uses"| node_cart
node_cart -->|"delegates operations"| node_storage_contract
node_session_storage -->|"implements"| node_storage_contract
node_session_storage -->|"reads and writes"| node_php_session

click node_cart "https://github.com/ultrasamad/shopping-cart/blob/main/src/Cart.php"
click node_storage_contract "https://github.com/ultrasamad/shopping-cart/blob/main/src/StorageInterface.php"
click node_session_storage "https://github.com/ultrasamad/shopping-cart/blob/main/src/SessionStorage.php"

classDef toneNeutral fill:#f8fafc,stroke:#334155,stroke-width:1.5px,color:#0f172a
classDef toneBlue fill:#dbeafe,stroke:#2563eb,stroke-width:1.5px,color:#172554
classDef toneAmber fill:#fef3c7,stroke:#d97706,stroke-width:1.5px,color:#78350f
classDef toneMint fill:#dcfce7,stroke:#16a34a,stroke-width:1.5px,color:#14532d
classDef toneRose fill:#ffe4e6,stroke:#e11d48,stroke-width:1.5px,color:#881337
classDef toneIndigo fill:#e0e7ff,stroke:#4f46e5,stroke-width:1.5px,color:#312e81
classDef toneTeal fill:#ccfbf1,stroke:#0f766e,stroke-width:1.5px,color:#134e4a
class node_caller toneIndigo
class node_cart toneMint
class node_storage_contract,node_session_storage,node_php_session toneAmber
```

## Components

### Other components

- **Application caller**
- [Cart API](https://github.com/ultrasamad/shopping-cart/blob/main/src/Cart.php): `src/Cart.php`
- [Storage contract](https://github.com/ultrasamad/shopping-cart/blob/main/src/StorageInterface.php): `src/StorageInterface.php`
- [Session storage](https://github.com/ultrasamad/shopping-cart/blob/main/src/SessionStorage.php): `src/SessionStorage.php`
- **PHP session state**

## Connections

- Application caller → Cart API: uses (evidence: `README.md`)
- Cart API → Storage contract: delegates operations (evidence: `src/Cart.php`)
- Session storage → Storage contract: implements (evidence: `src/SessionStorage.php`)
- Session storage → PHP session state: reads and writes (evidence: `src/SessionStorage.php`)