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PHP closures

PHP reference for php closures.

Syntax

$double = function (int $value): int {
  return $value * 2;
};

Examples

PHP closures example

A focused example you can adapt while practising.

$double = function (int $value): int {
  return $value * 2;
};

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 Functions & Type Declarations
PHP functions use the function keyword. Parameter and return type declarations can document and enforce the values a function accepts and returns.PHP function definitions
PHP reference for php function definitions.PHP union types
PHP reference for php union types.PHP default parameters
PHP reference for php default parameters.