Introduction
Acknowledgements
Content
Structure
1. Extension
2. Core
Constants
Functions
1. Arguments
2. 1. Scalar Types
  2. 1. Boolean
    2. Integer
    3. Floating point numbers
    4. Strings
  3. Compound Types
  4. 1. Arrays
    2. Objects
    3. Callable
    4. Iterable
    5. Enumerations
  5. Special Cases
  6. 1. Optional Parameters
    2. Passing by Reference
    3. Default Argument Values
    4. Variable-length Argument Lists (Variadics)
3. Return Values
4. 1. No Return Value
  2. Scalar Types
  3. Arrays
  4. Objects
Classes
1. Class Constants
2. Class Methods
3. Class Properties
4. Class Interface
5. 1. Implement an Interface
6. Class Inheritance
7. 1. Abstract Class
  2. Extend a Class

Acknowledgements

This work is heavily inspired by the following amazing content (in alphabetical order):

Copyright (c) 2022 - Flavio Heleno