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Deep Dive · Magento 2 Design Patterns

Iterator Pattern:
Collections and Varien_Data_Collection

How Magento's AbstractCollection implements PHP iterators, why lazy loading matters, and how to traverse large catalog data in a memory efficient way.

13 min read

Magento 2.4.8 · PHP 8.4

GoF Behavioral Pattern

Contents

1. 1. GoF Iterator Pattern: the interface
2. 2. PHP Iterator interface and IteratorAggregate
3. 3. Varien_Data_Collection: the foundation
4. 4. Magento AbstractCollection and lazy loading
5. 5. Collection filters, joins and pagination
6. 6. Chunked iterator: large catalogs without memory overflow
7. 7. PHP generators as lazy iterators
8. 8. Building a custom iterator for Magento
9. 9. Iterator vs. getItems(): performance comparison
10. 10. Conclusion: using collections correctly

The Iterator Pattern is one of the most commonly used GoF patterns in Magento, you use it every day whenever you iterate over a collection. foreach ($productCollection as $product) is the Iterator

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