Iterating PHP Iterators
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Iterating PHP Iterators

About the Book

Stop reinventing the loop

Looping over collections is something all programmers do. We keep writing the same code and building the same loops in project after project.  PHP has us covered though. We don't have to continue to re-invent the loop, we can use the tools provided.

The Standard PHP Library (SPL) gives you the tools you need

An important part of the SPL is the collection of Iterator classes and interfaces. These bits of magic, like the rest of the SPL, will change the way you program. They are power tools in every PHP programmer's toolbox. Like other power tools, if used safely, they can make a difference in how you code, and how fast.

Iterators help you create better programs, "Iterating PHP Iterators" will help you create iterators

"Iterating PHP Iterators" will show you the basic of PHP's Iterators. You will see how to implement them in your own code, as well as use them to do eveyrthing form filtering input to stupid party tricks. 

This is a great book for beginners and intermediate developers. It’s a comprehensive introduction to iterators and some of the implementations that ship with the SPL.

 - Christopher Pitt (Iterating PHP Iterators Review)

Easy start for beginners, but enough meat for those who already use Iterators 

- Mark (@Mark_Baker) Baker

#IteratingPHPIterators by @CalEvans is a great quick reference book if you use them regularly, or a good starter if you haven’t

- Ian (@icawebdesign) H.

Finished @CalEvans 'Iterating PHP Iterators'. Nice read. Should use them more often, especially to filter when looping.#php

- Stefan (@stefan_doorn) Doorn

"Iterating PHP Iterators"  is part of the "Learn One Thing Books" series. 

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About the Author

Cal Evans
Cal Evans

Many moons ago, at the tender age of 14, Cal touched his first computer. (We’re using the term “computer” loosely here, it was a TRS-80 Model 1) Since then his life has never been the same. He graduated from TRS-80s to Commodores and eventually to IBM PC’s.

For the past 17 years Cal has worked with PHP and MySQL on Linux, macOS, and Windows. He has built a variety of projects ranging in size from simple web pages to multi-million dollar web applications. When not banging his head on his monitor, attempting a blood sacrifice to get a particular piece of code working, he enjoys building and managing development teams using his widely imitated but never patented management style of “management by wandering around”.

These days, when not working with PHP, Cal can be found working on a variety of projects like Day Camp 4 Developers. He speaks at conferences around the world on topics ranging from technical talks to motivational talks for developers. If you happen to meet him at a conference, don’t be afraid to buy him a shot of Bourbon.

Cal is based in Nashville TN where he is happily married to wife 1.35, the lovely and talented Kathy. Together they have 2 wonderful kids who were both smart enough not to pursue a job in IT.

Cal Evans

Episode 44

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Table of Contents

  • Dedication
  • Chapter 1 – The What and Why of Iterators
    • What Are Iterators
    • Iterators vs. Iterable Interface
    • Why Use Iterators
    • Why Not Just Use Arrays
    • Two Kinds Of Iterators
    • Source Code
    • Summary
  • Chapter 2 - The Iterator Interface
    • Why Not Just Use The Built-in Iterators
    • Building Your Own Iterator
    • The Countable Interface
    • Summary
  • Chapter 3 - How Iterators Work
    • How An Iterator Operates
    • Summary
  • Chapter 4 - Outer Iterators
    • Pre-made Outer Iterators
    • Creating An OuterIterator
    • Summary
  • Chapter 5 - The ArrayIterator
    • ArrayObject
    • ArrayIterator
    • Why Use An Iterator For An Array?
    • Offsets
    • Flags
    • Summary
  • Chapter 6 - …Of Inputs And Outputs
    • Modifying Output
    • Restricting Inputs
    • Summary
  • Chapter 7 - The SeekableIterator Interface
    • Summary
    • Bonus
  • Chapter 8 – Recursing The Iterator
    • New Methods
    • RecursiveIteratorIterator
    • The Most Common Use Case
    • Summary
  • Chapter 9 - Iterating The File System
    • DirectoryIterator
    • FileSystemIterator
    • RecursiveDirectoryIterator
    • Summary
  • Chapter 10 - The Caching Iterator
    • CachingIterator And “Look Ahead”
    • Flags
    • Summary
  • Chapter 11 - Generators
    • What Are Generators?
    • A More Complete Example
    • Summary
  • Appendix A - A Bit Math Primer
    • Starting Small
    • Bigger And Better
    • Summary
  • NomadPHP

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