classes, interfaces and methods

[boyjarv]

Hi, I am trying to get my head around classes, interfaces and methods for different animals

 

this is what I have so far:

<?php 
interface animal {
  function walk();
  function fly();
  function swim();
}
class monkey implements animal{
  const interface1 = "I am from test class";

  function noise() {
    echo "ooh ooh ah ah!";
  } 

  function walk() { 
    echo "monkey is walking";
  }
  function fly() { 
    echo "monkey is Flying";
  }
  function swim() { 
    echo "monkey is Swimming";
  }
  public function display() {
    echo monkey::interface1;
    echo PHP_EOL;
  }

}

class bear implements animal{
  const interface1 = "I am from test class";

  function noise() {
    echo "Grrr!";
  } 

  function walk() { 
    echo "Bear is walking";
  }
  function fly() { 
    echo "Bear is Flying";
  }
  function swim() { 
    echo "Bear is Swimming";
  }
  public function display() {
    echo bear::interface1;
    echo PHP_EOL;
  }

}
$Obj = new monkey();
$Obj->display();
$Obj1 = new bear();
$Obj1->display();
?>

I'm a bit stumped as  animal interface not calling all functions?! please help

[ginerjm]

What reference materials have you read to learn about each of these tools? 

[benanamen]

An Interface does not "call" anything. I think the manual description is pretty clear what an Interface does.

Quote

Object interfaces allow you to create code which specifies which methods a class must implement, without having to define how these methods are implemented.

Source: http://php.net/manual/en/language.oop5.interfaces.php

[Barand]

Is this close to what you are trying to do?

interface animal 
{
    
    function noise();
    function action();
}

class beast implements animal
{
    function noise() 
    {
        echo "Silence<br>"; 
    }
    function action() 
    {
        echo "Does nothing<br>"; 
    }
    function display()
    {
        $this->action();
        $this->noise();
        echo "<hr>";
    }
}

class bear extends beast 
{
    function noise()
    {
        echo "Grrrrr<br>";
    }
    
    function action()
    {
        echo "The bear is running<br>";
    }
}

class bird extends beast
{
    function noise()
    {
        echo "Tweet tweet<br>";
    }
    
    function action()
    {
        echo "The bird is flying<br>";
    }
}

$obj = new bird;
$obj->display();

$obj = new bear;
$obj->display();

 

[maxxd]

1 hour ago, boyjarv said:

I'm a bit stumped as  animal interface not calling all functions?! please help

Why are you stumped? You're not calling the methods. @Barand beat me to it, but here's another take on what he is saying.

interface animal{
	public function walk();
	public function fly();
	public function swim();
}

class Cat implements animal{
	public function walk(){
		echo "Cat can walk";
	}
	public function fly(){
		echo "Cat no fly";
	}
	public function swim(){
		echo "Cat no like";
	}
}

class Dog implements animal{
	public function walk(){
		echo "Dog loves walk!";
	}
	public function fly(){
		echo "Dog doesn't fly...";
	}
	public function swim(){
		echo "Dog LOVES swim!!!!!!!";
	}
}

class Animals{
	private $_animal;
	public function __construct(animal $animal){
		$this->_animal = $animal;
	}
	public function display(){
		$this->_animal->walk();
		$this->_animal->fly();
		$this->_animal->swim();
	}
}

$cat = new Animals(new Cat());
$dog = new Animals(new Dog());

$cat->display();
$dog->display();

Also, it almost looks like you're mixing PHP and JavaScript - in PHP all variables are prepended with a dollar sign. And the use of const is possible in PHP, but the way you've used it here looks a bit more like JavaScript to me.

Edited December 4, 2018 by maxxd
tpyo

[Barand]

Other than not following the convention of using upper case for constant names, those declarations look fine. See manual

[maxxd]

5 minutes ago, Barand said:

Other than not following the convention of using upper case for constant names, those declarations look fine. See manual

Yeah, it's correct but somehow it feels like JavaScript - it's probably because I forgot you don't use dollar signs on constants...

[Barand]

That syntax

const MYCONST = "xyz";

does feel a little strange after years of using

define("MYCONST", "xyz");

 

[maxxd]

There's that, too - plus I've been trying to bone up on my ESNext skills over the past month or so, so that's kinda where my head is right now.