Could someone tell me whats wrong with this code?

class Cart {
var $items;

function add_item($item_id, $num, $money, $cost) {
$this->items[$num] *= $cost;
if($this->items[$money] > $cost){
$this->items[$cost] -= $money;
$this->items[$item_id] += $num;
unset($this->items[$cost]);
return true;
}elseif($this->items[$money] == $cost){
unset($this->items[$money]);
unset($this->items[$cost]);
$this->items[$item_id] += $num;
return true;
}else {
unset($this->items[$cost]);
return false;
}
}

function remove_item($item_id, $num) {
if ($this->items[$item_id] > $num) {
$this->items[$item_id] -= $num;
return true;
} elseif ($this->items[$item_id] == $num) {
unset($this->items[$item_id]);
return true;
} else {
return false;
}
}
function print_cart(){
$keys = array_keys($this->items);
foreach ($keys as $key) {
print $key. "=";
print $this->items[$key]."<br>";
}
}
}
$ncart = new Cart;
$ncart->add_item("aa", 1, 20, 10);
$ncart->add_item("bb", 7, 20, 10);
$ncart->print_cart();

The output of the code is

1=0
7=0

it should be

aa=1
bb=7


It appears to only show the cost and not the name of the item

It for learning purposes not actually going to use it anywhere

Umm as you know I don't know PHP but just trying to help.

$ncart = new Cart;
$ncart->add_item("aa", 1, 20, 10);
$ncart->add_item("bb", 7, 20, 10);
$ncart->print_cart();

I'm not sure if it is case sensative but it looks like you have Cart and cart there. Maybe change them both to lowercase or capital?

No its different the function is with a lowercase and the class is uppercase so its right the way i have it

Oh okay sorry I couldnt help you :/

No Problem im suspecting something with the array and the foreach loop

ok nvm guys i fixed it i should have wrote it like this
class Cart {
var $items;
var $money;

function add_item($item_id, $num, $cost) {
$money = 20;
if($money > $cost){
$this->items[$cost] -= $money;
$this->items[$item_id] += $num;
unset($this->items[$cost]);
return true;
}elseif($money == $cost){
unset($money);
unset($this->items[$cost]);
$this->items[$item_id] += $num;
return true;
}else {
unset($this->items[$cost]);
return false;
}
}

function remove_item($item_id, $num) {
if ($this->items[$item_id] > $num) {
$this->items[$item_id] -= $num;
return true;
} elseif ($this->items[$item_id] == $num) {
unset($this->items[$item_id]);
return true;
} else {
return false;
}
}
function print_cart(){
$keys = array_keys($this->items);
foreach ($keys as $key) {
print $key. "=";
print $this->items[$key]."<br>";
}
}
}
$ncart = new Cart;
$ncart->add_item("aa", 1, 10);
$ncart->add_item("bb", 7, 10);
$ncart->print_cart();