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║ 🐘 P H P O O P D O C U M E N T A T I O N B O O K 📖 ║
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║ Lectures ──▶ Interview Prep ──▶ Final Project ║
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🎯 This repo is for those who want to study everything related to OOP in PHP
with modern PHP 8.5+ syntax. All lectures follow the
official PHP documentation,
with interview questions and a final project to master it all.
📊 My Progress · 🚀 Get Started · 📚 Lectures · 💼 Interviews · 🏗️ Project
| Section | What’s inside | |
|---|---|---|
| 📊 | My Progress | Status, lecture list, milestones |
| 🎯 | Purpose | Why this book exists |
| 👤 | Who This Is For | Is this for you? |
| 🗺️ | Learning Path | Lectures → Interviews → Project |
| 📚 | Track 1 — Lectures | 31 sessions in 3 parts |
| 💼 | Track 2 — Interviews | 42 questions |
| 🏗️ | Track 3 — Final Project | SupportDesk Lite |
| 🚀 | How to Start | Your first step |
| 📁 | Repository Structure | Folder map |
| ⚙️ | Requirements | What you need |
| 🔗 | Official Sources | Trusted references |
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║ 📈 L E A R N I N G J O U R N E Y ║
╚══════════════════════════════════════════════════════════════╝
| Track | Progress | Status |
|---|---|---|
| 📚 Lectures | 8 / 31 | 🟡 In Progress — Lecture 9 next |
| 💼 Interview Questions | 0 / 42 | 🔒 Locked — starts after Lecture 31 |
| 🏗️ Final Project | 0 / 14 milestones | 🔒 Locked — starts after interviews |
Lecture Progress
| ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ⬜ | ⬜ | ⬜ | ⬜ | ⬜ | ⬜ | ⬜ | ⬜ | ⬜ | ⬜ | ⬜ | ⬜ | ⬜ | ⬜ | ⬜ | ⬜ | ⬜ | ⬜ | ⬜ | ⬜ | ⬜ | ⬜ | ⬜ |
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
[████████░░░░░░░░░░░░░░░░░░░░░░░░░] 26%
🎯 Current focus: Lecture 9 — Asymmetric Visibility
🏁 Last completed: Lecture 8 — Property Hooks (PHP 8.4)
🏅 Milestone 1 (after Lecture 5) — ✅ Passed
📗 Part 1 — Foundations · Lectures 1–10 · Part-1-Foundations/
| # | Folder | Topic | Status |
|---|---|---|---|
| 01 | why-not-only-functions |
Why Functions Alone Are Not Enough | ✅ |
| 02 | class-and-object |
Class and Object | ✅ |
| 03 | properties |
Properties | ✅ |
| 04 | methods |
Methods | ✅ |
| 05 | Milestone-constructor |
Constructor (Milestone) | ✅ |
| 06 | visibility |
Visibility | ✅ |
| 07 | encapsulation |
Encapsulation | ✅ |
| 08 | property-hooks |
Property Hooks (PHP 8.4) | ✅ |
| 09 | asymmetric-visibility |
Asymmetric Visibility (PHP 8.4) | 🟡 Next |
| 10 | inheritance |
Inheritance | ⬜ |
📘 Part 2 — Core OOP · Lectures 11–20 · Part-2-Core-OOP/
| # | Folder | Topic | Status |
|---|---|---|---|
| 11 | method-overriding |
Method Overriding & parent |
⬜ |
| 12 | static-and-constants |
Static & Class Constants | ⬜ |
| 13 | abstract-classes |
Abstract Classes | ⬜ |
| 14 | interfaces |
Interfaces | ⬜ |
| 15 | Milestone-polymorphism |
Polymorphism (Milestone) | ⬜ |
| 16 | type-declarations |
Type Declarations | ⬜ |
| 17 | covariance-contravariance |
Covariance & Contravariance | ⬜ |
| 18 | traits |
Traits | ⬜ |
| 19 | magic-methods |
Magic Methods | ⬜ |
| 20 | objects-and-references |
Objects & References | ⬜ |
📙 Part 3 — Modern PHP · Lectures 21–31 · Part-3-Modern-PHP/
| # | Folder | Topic | Status |
|---|---|---|---|
| 21 | final-and-cloning |
Final & Cloning | ⬜ |
| 22 | readonly-classes |
Readonly Classes (PHP 8.2 & 8.5) | ⬜ |
| 23 | namespaces-autoloading |
Namespaces & Autoloading (PSR-4) | ⬜ |
| 24 | Milestone-enumerations |
Enumerations (Milestone) | ⬜ |
| 25 | exceptions |
Exceptions & Errors | ⬜ |
| 26 | attributes |
Attributes (PHP 8.0 – 8.5) | ⬜ |
| 27 | anonymous-classes |
Anonymous Classes & Iteration | ⬜ |
| 28 | lazy-objects |
Lazy Objects (PHP 8.4) | ⬜ |
| 29 | lsb-comparison-serialization |
LSB, Comparison & Serialization | ⬜ |
| 30 | mini-project-blog |
Mini-Project: Blog System | ⬜ |
| 31 | Milestone-phpunit-testing |
PHPUnit Testing (Milestone) | ⬜ |
| Milestone | After Lecture | Status |
|---|---|---|
| 🥉 Milestone 1 — First Objects | 05 | ✅ Passed |
| 🥈 Milestone 2 — Core OOP | 15 | ⬜ Not yet |
| 🥇 Milestone 3 — Modern PHP | 24 | ⬜ Not yet |
| 🏆 Milestone 4 — Full Track Complete | 31 | ⬜ Not yet |
📝 Progress is synced from
01-Lectures/README.md. Update both files when a lecture is completed.
┌─────────────────────────────────────────────────────────────┐
│ " From procedural scripts → to professional OOP code " │
└─────────────────────────────────────────────────────────────┘
Object-Oriented Programming is how real PHP applications are built — from Laravel and Symfony to custom APIs and SaaS products. Yet most tutorials either skip modern language features or teach outdated patterns.
| 🧩 | Learn every core OOP concept in PHP using modern syntax PHP 8.5+ |
| 📜 | Study from official sources — grounded in the PHP manual, not random blog posts |
| 💬 | Practice interview questions — explain what you know with confidence |
| 🏆 | Build a real capstone project — prove mastery from scratch |
🚫 No framework. 🚫 No shortcuts. ✅ Just PHP, objects, and real skill.
| 🧑💻 You are… | 📈 This book helps you… |
|---|---|
| 🌱 A PHP beginner variables, functions, arrays, loops |
Move from procedural PHP to object-oriented thinking |
| 🔍 A self-taught developer | Fill gaps with a clear, ordered curriculum |
| 🎤 Preparing for PHP interviews | Practice 42 focused OOP questions with code |
| 📜 A learner who wants official sources | Follow lectures tied directly to the PHP manual |
| 🎓 No CS degree required | ✍️ You write all the code | 📅 One session at a time |
|---|
╭──────────────────────────────────────────────────────╮
│ │
│ 📚 TRACK 1 💼 TRACK 2 🏗️ TRACK 3 │
│ ────────── ────────── ────────── │
│ 31 Lectures ──▶ 42 Questions ──▶ Final Project │
│ Official Docs Interview Ready SupportDesk │
│ │
╰──────────────────────────────────────────────────────╯
│
▼
🏅 OOP Mastery Achieved
⚠️ Complete the tracks in order. Each track builds on the previous one.
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║ 📖 C H A P T E R 1 · L E C T U R E S ║
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| 📂 Track folder | 01-Lectures/ — guide + workspace |
| 🔢 Sessions | 31 lectures — one concept per session |
| 🗂️ Structure | 3 parts: Foundations → Core OOP → Modern PHP |
| 📜 Source | Official PHP Manual |
How lectures are organized:
Part-1-Foundations/ → Lectures 01–10
Part-2-Core-OOP/ → Lectures 11–20
Part-3-Modern-PHP/ → Lectures 21–31
What you will learn:
🧱 Classes & Objects 🔐 Encapsulation & Visibility
🧬 Inheritance & Interfaces 🧩 Traits & Abstract Classes
🏷️ Enums & Attributes ⚡ Lazy Objects & Property Hooks
📦 Namespaces & Autoloading 🧪 PHPUnit Testing
📊 My current progress: 8 / 31 lectures done — next is Lecture 9 — Asymmetric Visibility.
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║ 🎤 C H A P T E R 2 · I N T E R V I E W S ║
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| 📂 Track folder | 02-Interview-Questions/ — guide + workspace |
| 🔢 Questions | 42 questions — realistic & code-based |
| 🔗 Linked to | Every question maps back to a lecture |
What interviewers test:
❓ What is OOP? ❓ Four OOP principles?
❓ Class vs Object? ❓ Instantiation & constructors?
❓ Encapsulation in practice ❓ Abstract vs Interface?
❓ Static vs instance methods ❓ Traits & conflict resolution
❓ Readonly & immutability ❓ Testing with PHPUnit
💡 Start this track only after completing all 31 lectures.
| Progress | Status |
|---|---|
| 0 / 42 | 🔒 Not started yet |
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║ 🏆 C H A P T E R 3 · F I N A L P R O J E C T ║
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| 📂 Track folder | 03-Final-Project/ — guide + workspace |
| 🎯 Project | SupportDesk Lite — customer support ticketing system |
| 🛠️ Stack | Pure PHP · No framework · No database required at first |
What you will build:
🎫 Create & manage support tickets
👥 Customers and support agents
💬 Public replies & internal notes
🔄 Status & priority workflows
💾 In-memory & file storage
🔔 Notification system
🧪 PHPUnit test coverage
🏅 This is your final proof — not a lecture replacement.
| Progress | Status |
|---|---|
| 0 / 14 milestones | 🔒 Not started yet |
STEP 1 STEP 2 STEP 3 STEP 4
📖 ──▶ 📝 ──▶ 💼 ──▶ 🏗️
Lecture 1 Write Code Interviews Project
| Step | Action | Where |
|---|---|---|
| 1️⃣ | 📖 Open the lecture guide and start Lecture 1 | 01-Lectures/ → Lecture-01-why-not-only-functions/ |
| 2️⃣ | ✍️ Type each example into that lecture’s code-N.php files — one session at a time |
e.g. Lecture-09-asymmetric-visibility/ |
| 3️⃣ | 💼 After all 31 lectures, practice interview answers | 02-Interview-Questions/ |
| 4️⃣ | 🏗️ Build the capstone when interviews are done | 03-Final-Project/ |
✍️ Remember: You write all the code. The guides teach; your practice files live inside each lecture folder.
📦 php-oop-documentation/
│
├── 📄 README.md ← 📘 Start here · repo overview
│
├── 📂 01-Lectures/ ← 📚 Track 1 · guide + workspace
│ ├── README.md ← Curriculum & progress
│ ├── Part-1-Foundations/ ← Lectures 01–10
│ │ ├── Lecture-01-why-not-only-functions/
│ │ ├── Lecture-05-Milestone-constructor/
│ │ ├── Lecture-09-asymmetric-visibility/ ← 🟡 you are here
│ │ └── ...
│ ├── Part-2-Core-OOP/ ← Lectures 11–20
│ │ ├── Lecture-11-method-overriding/
│ │ ├── Lecture-15-Milestone-polymorphism/
│ │ └── ...
│ └── Part-3-Modern-PHP/ ← Lectures 21–31
│ ├── Lecture-21-final-and-cloning/
│ ├── Lecture-31-Milestone-phpunit-testing/
│ └── ...
│
├── 📂 02-Interview-Questions/ ← 💼 Track 2 · 42 questions
│ ├── README.md
│ ├── Question-01-what-is-oop/
│ └── ...
│
└── 📂 03-Final-Project/ ← 🏆 Track 3 · SupportDesk Lite
├── README.md
├── src/ ← (student-created)
└── tests/ ← (student-created)
💡 Each track folder is self-contained — open it on GitHub and its guide appears automatically.
🏷️ Lecture folders useLecture-NN-topicso you can find the right session at a glance.
| 🐘 | PHP 8.5+ |
| 📖 | Basic PHP — variables, functions, arrays, control structures |
| 💻 | A local PHP environment to run .php files |
| 📦 | Composer & PHPUnit (introduced later) |
📜 All lecture and interview content is built on trusted, official documentation.
| Source | Link |
|---|---|
| 🐘 PHP Manual — OOP | php.net/manual/en/oop5.intro.php |
| 📖 PHP Language Reference | php.net/manual/en/langref.php |
| 🧪 PHPUnit Documentation | docs.phpunit.de |
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║ 📘 Read. ✍️ Write. 💬 Explain. 🏗️ Build. 🏅 Master. ║
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Documentation provided for learning purposes.
Refer to the official PHP manual for authoritative language behavior.
🐘 Happy Learning!