Codectionary / Developer documentation / PHP

PHP array_filter

PHP reference for php array_filter.

Syntax

$even = array_filter([1, 2, 3, 4], fn (int $n): bool => $n % 2 === 0);

Examples

PHP array_filter example

A focused example you can adapt while practising.

$even = array_filter([1, 2, 3, 4], fn (int $n): bool => $n % 2 === 0);

Best practices

  • Start with the smallest working example, then adapt it to your project.
  • Use the language’s standard library and idioms before introducing extra dependencies.

At a glance

Purpose
Server-side web applications
File extension
.php
Runs in
PHP runtime on a server or CLI
Usually used with
HTML, databases and web servers

Specifications & further reading

Related PHP documentation

PHP Arrays
PHP arrays are ordered maps: they can use integer indexes or string keys. Array literals use square brackets.PHP indexed arrays
PHP reference for php indexed arrays.PHP associative arrays
PHP reference for php associative arrays.PHP array destructuring
PHP reference for php array destructuring.