arrays

7 tutorials

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PHP Intermediate

array_intersect_key: The Input Whitelist Hiding in the Standard Library

Mass-assignment bugs happen when request data flows unfiltered into updates. Two array functions - intersect_key and diff_key - are the terse, auditable filter.

Feb 8, 2026 2 min 474

PHP Beginner

natsort, Collator and the Spaceship: PHP Sorting Like a Human

"item10" before "item2", "Öl" after "z", uppercase clustering before lowercase - default sorts betray human expectations three different ways. PHP has a fix for each.

Feb 4, 2026 2 min 238

PHP Beginner

PHP Array Destructuring Goes Further Than You Think

Keyed destructuring, foreach unpacking, swaps, nested extraction - the [$a, $b] syntax has quietly become one of PHP's best readability tools.

Jan 28, 2026 2 min 165

JavaScript Beginner

toSorted() and Friends: Arrays That Stop Mutating Under You

sort() silently rearranges the original array - a bug factory in shared state. ES2023 shipped non-mutating twins for the worst offenders, plus with() for single-item replacement.

Jan 3, 2025 2 min 1,108

JavaScript Beginner

Array.from({ length }) Is JavaScript's Missing range()

Python has range(), PHP has range() - JavaScript has a weird-looking idiom that does the same and more, once you understand why the mapping callback is built in.

Dec 24, 2024 2 min 2,847

PHP Beginner

array_column() Does Way More Than Grab a Column

The third parameter turns array_column into a re-indexing tool, it reads object properties, and combined with array_map it handles most of your collection reshaping.

Sep 15, 2024 2 min 1,402

JavaScript Beginner

Object.groupBy() Ends a Decade of reduce() Boilerplate

Grouping an array of objects used to mean writing the same reduce() dance in every project. JavaScript finally does it natively, and the syntax is one line.

Jan 9, 2024 2 min 3,717