Interfaces in PHP. Code examples

Interfaces – a certain abstract template, which in the future should follow the class that uses this interface. You can create methods in the interface, but they must have no implementation. The interface ensures that the class will have some functionality that is described in the interface.

Use a keyword interface to create the interface

interface iProfile {
}

Inside the interface you need to create methods that do not have implementation (function names and a list of parameters in parentheses followed by a semicolon).

interface iMessenger
{
    function createprofile($name);
}

Implementation of the class interface

A class implements an interface using the “implements” keyword, followed by the name of the interface to use:

interface iProfile

{
    function createprofile($name);
}

class Moderator implements iProfile 
{
    function createprofile($name);
    {
        echo "profile created!";
    }
}

Inheriting an interface from another interface

//create interface
interface iProfile
{
    function createprofile($name);
}

//implement the interface with another interface
interface iAdmin extends iProfile
{
     
}

Example of interface implementation:

//create interface
interface iMessenger
{
    function send($message);
}

//a function that will send a message, which takes the messenger object as the first parameter and the text to be sent as the second parameter.
//In the function itself, the first parameter is an object that necessarily implements the iMessenger interface, so we can call the send() method on it to send a message.
function sendMessage(iMessenger $messenger, $text)
{
    $messenger->send($text);
}

//create a class that inherits the Messenger interface
class EmailMessenger implements iMessenger 
{
    function send($message)
    {
        echo "Sending a message to email: $message";
    }
}
$outlook = new EmailMessenger();
sendMessage($outlook, "Hello World");
?>

The class can use many interfaces

//interfaces are listed in commas
class Mobile implements iCamera, iMessenger
{
    function makeVideo(){ echo "Video Record";}
    function makePhoto(){ echo "Make photo";}
}