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PHP interfaces

PHP reference for php interfaces.

Syntax

interface Greets {
  public function greet(): string;
}

Examples

PHP interfaces example

A focused example you can adapt while practising.

interface Greets {
  public function greet(): string;
}

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 Classes & Interfaces
Classes define objects, while interfaces define methods an implementing class must provide. Visibility controls whether members are public, protected, or private.PHP namespaces
PHP reference for php namespaces.PHP use imports
PHP reference for php use imports.PHP class definitions
PHP reference for php class definitions.