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PHP readonly properties

PHP reference for php readonly properties.

Syntax

class Config {
  public function __construct(public readonly string $apiKey) {}
}

Examples

PHP readonly properties example

A focused example you can adapt while practising.

class Config {
  public function __construct(public readonly string $apiKey) {}
}

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

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