The fourth quarter accounts for 40-60% of annual revenue for most e-commerce stores. Black Friday, Cyber Monday and Christmas shopping create traffic that far exceeds the average. Stores that didn’t prepare technically don’t lose orders to competitors – they simply can’t handle the load. Below is the checklist I go through with clients before every season.

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A custom admin grid in Magento 2 is a recurring task for any substantial module. Magento provides a full UI Component framework for it: declarative XML defines columns, filters, and actions, while PHP only supplies the DataProvider. Below is a minimal but complete example – from database migration through model to listing.xml.

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The Iterator pattern defines sequential access to collection elements without exposing its internal structure. PHP implements it through the Iterator and IteratorAggregate interfaces. Generators (available since PHP 5.5) are syntactic sugar that simplifies writing iterators considerably – especially for lazily generating large datasets.

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Dynamic programming is a technique for solving problems by breaking them into smaller subproblems and caching the results. It’s used less frequently in PHP than in lower-level languages, but shows up wherever naive recursion is too slow. I cover two approaches: memoization (top-down) and tabulation (bottom-up) through concrete examples.

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