abstraction.php

<?php
// abstracted code
// create the abstract class
// basically a class that says any child classes need a method called get_drink_name and a variable called _drink_state
abstract class HotDrinksAbstract
{
    abstract function get_drink_name();
    // now if anyone else uses the HotDrinksAbstract Class, they will all have to specify a get_drink_name function
    protected $_drink_state = 'hot';
    // now all child classes will have the variable _drink_state available to them, and it will return hot
    // no point in having a private function/variable since it won't be available in child classes
}

// hot cocoa example demonstrating the protected variable from the abstract class
class AbstractHotCocoa extends HotDrinksAbstract
{
    public function get_drink_name()
    {
        return "The best $this->_drink_state chocolate of your life <br/> ";
    }
}
echo 'Abstracted Code - Hot Cocoa: <br/>';
$hot_cocoa = new AbstractHotCocoa();
print_r($hot_cocoa->get_drink_name());

// latte example demonstrating overriding the protected variable from the parent class
class AbstractLatte extends HotDrinksAbstract
{
    protected $_drink_state = 'cold or hot';
    // the initial protected class can be overridden in the child class

    // this class MUST HAVE a function get_drink_name()
    public function get_drink_name()
    {
        return "Lattes are good $this->_drink_state <br/> ";
    }
}
echo '<br/> Abstracted Code - Latte: <br/>';
$_latte = new AbstractLatte();
print_r($_latte->get_drink_name());

// ----------------------------------------
// your code
echo '<br/> Your code: <br/>';
class HotDrinks
{
    public $drink;
    function __construct($drink)
    {
        $this->drink = $drink;
    }
    function get_drink()
    {
        return $this->drink;
    }
}
$drink = new HotDrinks("Latte");
echo $drink->get_drink();