PHP Iterators & Iterable Type - Iterate Over Objects - Full PHP 8 Tutorial

In this lesson, you will learn what iterators are & how to work with them in PHP. It may sound scary but it's actually pretty simple. With iterators you can define how you want your objects to be iterated on, by default when you iterate over objects in PHP it will iterate on visible properties on the object but sometimes you may want to iterate on a specific property of the object instead. Learn what Iterator, IteratorAggregate & Traversable interfaces are, what iterable data type is & how to implement a basic collection pattern that you might be familiar with from frameworks like Laravel.

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LESSON 2.22

RESOURCES

CHAPTERS
00:00 - Iterating over objects
01:33 - Traversable, Iterator & IteratorAggregate interfaces
02:11 - Implement simple collection class using Iterator interface
07:50 - SPL iterators & refactoring collection to use IteratorAggregate interface
10:26 - Iterable type & type-hinting

[ousssika]

i have been using youtube for 15 years to study, hands down your the best teacher, tha a man can hope for

[Vitalii-mr]

Hands down, this is the best explanation of Iterators I've even seen. Thanks!

[lynic-]

Jaw drop, I had no friggin clue something like this was possible. This is the best PHP course I've ever seen.

[Nooneandeveryone]

Every time I see the number of subscribers increased I feel really happy, cause I hope every body watches this series in which you're making programming more exciting and more fun! thank you

[ВладиславСоколенко-уй]

Thank you mush for one another topic. Very interesting to study PHP with your lessons.🙂

[nextLevelYou-do]

I'm really enjoying this series and learning more
Respect from Pakistan.

[khusamalfas]

This the best class about iterators with examples. Keep it up will done.

[FranciscoJunior]

Thank you so much for sharing this content of excellent quality.

[Zubbee]

Great lesson, I've bagged another one (need to practice though). Thanks alot Gio.

[Haamome]

i love you bro thank you so much for all those videos clear and simple example that make it easy.

[neriusshaqiri]

Thank you for tor sharing this, great video!

[diarqoroviqi]

Great lesson, it would be greater if you add an iterator example of linked list? Thank you :)

[abdallahdamra]

instead of implementing iterator, why not just use nested foreach loop?
or you just did it to show the implementation of iterator?

[derzskyi]

Thank you! "Invoice" inside "InvoiceList" iterable must have public properties, but what if I don't want to expose the internal state of that object. What are the options for this?

[brtj]

Hi, may i ask that next method 4:35 must return void, why are you returning next($this->invoices) ? Its throwing errror in my IDE

[paulfontaine]

9:50 off topic: i would have used a trait for getIterator, leaving more freedom to inherit from another class..

[houbaben]

Hello Sir, I am having a problem when I use the iterator interface, I am getting the result but before it there is a message telling me that:
Deprecated: Return type of app\InvoiceCollection::key() should either be compatible with Iterator::key(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice

[dameeldiop]

I've been watching this video as guide to iterate over an object (deep nested, tree data) using RecursiveIteratorIterator & RecursiveArrayIterator but couldn't make it work.
Any enlightenment on those recursive classes?

[thrldr]

I didn't quite get why variable $key in the InvoiceCollection class got initialized with 0 whereas you haven't explicitly set it to be. Is this some feature of php8 or am I missing something? Because my interpreter doesn't allow for it.

[giotapetrou]

I tried the code and I still get the error "Fatal error: Uncaught Error: Cannot access protected property App\Lesson222\Invoice::$id". I'm I missing something?