Invoice Management System in PHP with Source Code

A fully functional project based on Online Invoice Management System that uses PHP Language with MySQL database. Following PHP project contains all the essential features which can be in use for the second year IT students for their college projects. It has a number of features that will allow users to manage invoices as well as product details. This system as well as the web application’s concept is all clear, it’s the same as real-life scenarios and well-implemented on it. To download free invoice management system project in PHP MySQL with source code files, please scroll down to the bottom of this post for the Download button.

About Invoice Management System PHP Project

In particular, this Invoice Management System project in PHP MySQL focuses mainly on keeping track of invoices as well as their product sales. Also, the system displays all the products with their respective details. In addition, the system allows managing customers’ records. Evidently, this project only contains an admin panel. In an overview of this web application, an administrator has full control over the system. He/she can manage invoices, users, customers, and products. Here, each and every section has its own respective details such as name and other important details. However, the admin set random product names with rates for generating invoices. Or the admin can select from an existing record.

Customer and Product Management

Likewise, the system also allows managing these records. For this, the user has to provide product names with the rate amount. Also, this particular section is a kind of optional field for managing invoices. Meanwhile, the completion of all these fields leads us to customer management. In fact, this section requires a number of details for its management. It includes the name of the customer with its contact, addresses information. Here, this field can be optional for maintaining invoices too. The user can select numerous product items under the same invoices. With it, the system automatically displays the rate amount of each for the billing process.

Manage Invoices and User Management

On the other hand, the main feature of this invoicing system is to create invoices with respect to its sales. Nevertheless, the admin can proceed with the invoicing side of customers’ orders for sales management. Here, an admin needs to provide the due dates, customer information with the selection of product items, quantity. Also, the system allows adding discount amounts. Else, all other amounts such as TAX, VAT are automatically added by the system during its calculation. At first, the system lists each record as unpaid status and the user has to update records according to its bill status. In addition, the admin can include shipping charges too. With such management, the system generates an overall invoice for each customer. Later, the user can simply download to view the invoice file which comes in a PDF format. Besides, the admin can manage system users too.

Last but not least, a clean and simple dashboard is presented with various color combinations for greater user experience while using this Invoice Management System Project in PHP MySQL. For its UI elements, a free open-source CSS framework; Bootstrap is on board with some Vanilla CSS too. Presenting a new Online Invoicing System Project in PHP MySQL which includes an admin panel that contains all the essential features to follow up, and a knowledgeable resource for learning purposes.

Available Features:
  • Admin Panel
  • Generate Invoices
  • Download Invoice (PDF)
  • Export Invoice (csv)
  • TAX, VAT, Shipping Inclusion
  • Total Sales Amount
  • Due Amount
  • Paid, Pending Bills
  • Manage Invoice Records
  • Product Management
  • Customer Management
  • System User Management
Project Name:Invoice Management System
Language/s Used:PHP
PHP version (Recommended):5.6, 7.4
Type:Web Application
Developer:Abhishek Raj
Online Invoice Management System PHP Project Overview

Instructions: How to Run?

  • After you finish downloading the project, unzip the project file and head over to your XAMPP directory.
  • There you’ll find a folder naming “htdocs”.
  • Inside the “htdocs” folder, paste the project folder (not the .zip one, but the extracted one).
  • Open your favorite browser; we recommend using Google Chrome or Mozilla Firefox.
  • Then, go to URL “http://localhost/phpmyadmin“.
  • Create a Database with a name that is provided inside the “01 LOGIN DETAILS & PROJECT INFO.txt”.
  • Click on the “Import” tab and choose the database file (.sql) which is provided under the folder naming “DATABASE FILE”.
  • After setting up all these, go to URL “http://localhost/[ PROJECT_FOLDER_NAME ]/“
  • All the login details are provided inside the project folder, check that out and enter in order to use it.

And there you have it, a full setup of the Invoice Management System project in PHP. For this particular PHP project, PHP Version 5.6 or Newer is required because the project does not operate with the oldest PHP version. So, users with the oldest PHP version (older than 5.6) might face various problems while operating it. As a result, you’ll need to manage your PHP version (only if you’re using the old version) at the moment. Also, Download Free Invoicing System Project in PHP MySQL Source Code. So, this online invoice system PHP project is a fully functional project for all the intermediate levels that broads vast knowledge into such PHP web applications. In conclusion, this whole PHP project with free source code is an absolute project and a meaningful way for the users to learn and explore more about it.

Free Download Invoice Management System Project in PHP MySQL with Source Code:
Click the Download Button Below to Start Downloading

Note: Only for Educational Purpose


    1. Please check the “Manage Invoice” section and there you’ll find your requested invoice. Truth is that the users with the latest PHP version will face these alert messages after submitting the “generate invoice” button but still, the system generates it for you. And you can view/download those invoices from the Manage Invoice sections!

      1. I can only create “Open” and “Paid” invoices. If my customers do not pay in full but partially , how do create that ?

  1. While trying to update an invoice it shows garbage text (lots of error message) on every fileld. Some times it creates duplicate invoices!!

  2. Truth is that the users with the latest PHP version will face these alert messages after submitting the “generate invoice” button but still, the system generates it for you. And you can view/download those invoices from the Manage Invoice sections!

    How to fix this errors ? also we try to edit invoice it deletes invoice items from database. can you please help ?

      1. This php code should convert to PDO instead mysqli then it will be perfect system for small bussiness like mine

  3. Hi,

    It seems like I cannot login and I have an error message like this
    “Error : (1045) Access denied for user ‘root’@’localhost’ (using password: NO)”

    How to connect PHP to Database?

    Thank you

        1. Inside the project’s config file, you’ll need to make changes under the “Database Information”
          Please have a look at DATABASE _ USER, DATABASE _ PASS. (by default the DATABASE _ PASS field is empty and seems like you’ve your own password for that, so please fill it out!)

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