PHP arrow functions with array_map and array_filter

PHP Dasun Kalupahana October 15, 2026 80 views

<?php

$nums = range(1, 10);
$result = array_map(fn ($n) => $n ** 2, array_filter($nums, fn ($n) => $n % 2 === 0));
echo implode(' ', $result), PHP_EOL; // 4 16 36 64 100

$factor = 3;
echo implode(',', array_map(fn ($n) => $n * $factor, [1, 2, 3])), PHP_EOL; // 3,6,9

Arrow functions (fn) are one-line closures that capture outer variables by value automatically. Note that array_filter keeps keys, so wrap it in array_values() if you need a reindexed list. Needs PHP 7.4+.

#php #php7.4 #arrow-functions #array_map #array_filter #functional