Customers Overview (CSV Processing)

A small PHP project built during my PHP basics/intro module.
The goal was to read customer data from a CSV file, process it, and display useful information such as counts and filtered results.

This project was completed after my final exam as additional practice.
I continued working through extra exercises to strengthen my PHP fundamentals and improve my backend skills.

Module: PHP Basics
Goal: File Handling, Arrays & Data Processing
Status: ✅ Completed
Version: 1.0
Tech: PHP

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📌 Project Overview

This project loads customer data from a CSV file (p2b.kunden.csv) and presents it in a structured overview.
The task was designed to practice file handling, working with arrays, and performing simple data processing operations using PHP.

After reading the CSV file, the app displays:

• A list of all customers
• Total number of customers
• Number of male customers
• Number of female customers

Additionally, the project includes sorting functionality that allows users to reorder the list by query parameters passed via the URL (e.g., ?sortby=lastname&order=asc).

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✨ Features

• Reads customer data from a CSV file
• Converts raw CSV rows into associative arrays
• Displays total, male, and female customer counts
• Sorting by:
  • Last name
  • Gender
• Query parameter handling for sorting (sortby, order)
• Simple and clear output for testing and learning purposes

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🧠 What I Learned

• How to read and parse CSV files in PHP (fopen, fgetcsv)
• Building associative arrays from raw file data
• Filtering arrays using callback functions
• Basic sorting logic with usort()
• Handling query parameters via $_GET
• Structuring small scripts that combine logic and output

This was one of my early PHP projects and introduced the fundamentals of working with data, processing it, and presenting results — skills that later became essential in more advanced backend applications.