How to sum the array of ingredient? - php

Question

I am trying to implement the getCost() function using a forloop but i am new to php and having trouble with understanding how to implement. i just keep getting error saying undefined variable.
Here is my code
<?php
class Burger {
public $title = '';
private $ingredients = array();
public function __construct($n) {
$this->name = $n;
}
public function addIngredient($ing) {
array_push($this->ingredients, $ing);
}
public function getCost() {
foreach( $ingredients as $ingredient=> $costDollars){
$price += $costDollars;
return $price;
}
} }
class Ingredient {
public $name = 'Ingredient'; public $costDollars = 0.0;
public function __construct($n, $c) {
$this->name = $n;
$this->costDollars = $c;
} }
$myBurger = new Burger('Tasty Burger');
$myBurger->addIngredient(new Ingredient('Meat', 0.3));
$myBurger->addIngredient(new Ingredient('Cheese', 0.2));
$myBurger->addIngredient(new Ingredient('Beetroot', 0.2));
$myBurger->addIngredient(new Ingredient('Pineapple', 0.4));
echo $myBurger->getCost(); ?>

Answer 1

You're forgetting $this when you're trying to access the class property $ingredients:
public function getCost() {
$price = 0;
foreach( $this->ingredients as $ingredient){
$price += $ingredient->costDollars;
}
return $price;
}
As you can see in the above code, the return-statement is also moved after the loop. If you have the return in your loop, the variable will be returned after the first iteration.

Answer 2

<?php
class Burger {
public $title = '';
private $ingredients = array();
public function __construct($n) {
$this->name = $n;
}
public function addIngredient($ing, $cost) {
$this->ingredients += array($ing => $cost); // Wont overide! EXTRA CHEEZ PLZ
}
public function getCost() {
//forloop
$totalprice = 0; // Start Register Cha Ching!
foreach($this->ingredients as $ing => $price){ // Add Items (*scanner Beeps*
$totalprice += $price;
} // All Done with items, let return cost
return $totalprice; // Return Value to Function Call
}
}
$myBurger = new Burger('Tasty Burger');
$myBurger->addIngredient('Meat', 0.3);
$myBurger->addIngredient('Cheese', 0.2);
$myBurger->addIngredient('Beetroot', 0.2);
$myBurger->addIngredient('Pineapple', 0.4);
echo $myBurger->getCost(); ?> // ECHO Value to Function Call