Invoice App SaaS

A robust, lightweight PHP application designed for small businesses and freelancers to generate and manage invoices efficiently. Built on a custom MVC framework, this application demonstrates core web development concepts including routing, authentication, and database interaction without relying on heavy frameworks.

Features

• Secure Authentication: User registration and login system handling secure sessions.
• Invoice Management:
  • Create detailed invoices with multiple line items.
  • Automatic tax and total calculations.
  • View and manage invoice history.
• PDF Generation: Instant PDF export functionalities using mpdf, allowing users to download or print invoices.
• Custom MVC Architecture: built from scratch to provide a deep understanding of core PHP mechanics.
• Responsive UI: Clean and user-friendly interface.

Tech Stack

• Backend: PHP 8.0+
• Database: MySQL
• Frontend: HTML5, CSS3, JavaScript
• Dependencies: mpdf/mpdf (PDF generation), vlucas/phpdotenv (Environment management)

Requirements

• PHP 8.0+
• MySQL
• Composer

Installation

1. Install Dependencies

   composer install

2. Database Setup

   • Create a database named invoice_app.
   • Import the schema:

     mysql -u root -p invoice_app < database/schema.sql

   • Check .env and update DB credentials if necessary.

Running the App

Option A: PHP Built-in Server (Recommended)

Run the following command in the project root:

php -S localhost:8000 -t public

Visit: http://localhost:8000

Option B: Apache (XAMPP/WAMP)

• Ensure the project is in xampp/htdocs/invoice-app.
• Visit: http://localhost/invoice-app/public
• Note: Ensure mod_rewrite is enabled.