Functional Programming with PHP

Introduction

• A functional approach to transform code
• What you should know
• Installing and running PHP

1. Introductory Functional Concepts

• Why use functional programming?
• What is declarative programming?
• Immutability in functional programming
• Separation of data and functions
• First-class functions

2. First-Class Functions

• Functions as data, part 1
• Functions as data, part 2
• Passing functions as arguments
• Returning functions
• Closure
• Higher-order functions
• Arrow functions in PHP

3. PHP: The Functional Parts

• Working with arrays, functionally
• The spread operator and array_merge
• Mapping
• Filtering
• Passing keys to array functions
• Sorting
• Custom sorting behavior with usort
• Reducing
• Combining array functions
• Challenge: Recreating the array_map function
• Solution: Recreating the array_map function

4. Advanced Functional Concepts

• Advanced functional concepts
• Partial application and currying
• Recursion
• Composition, part 1
• Composition, part 2

5. Code Conversion Challenges

• Challenge: Property getter
• Solution: Property getter
• Challenge: Tallying votes
• Solution: Tallying votes
• Challenge: Value or array
• Solution: Value or array

Conclusion

• Next steps