Session wrapper class. Set multi dimensional array - php

Question

I have a wrapper class for my $_SESSION array because I like to work with objects and it sort of prevents me from getting lazy and calling the super global from places I should not.
It used to be ok to have a simple:
public function get($name);
public function set($name, $value);
public function exists($name);
......
but now I am implementing a shopping service and it has a shopping cart and when the user adds an item to the cart it sets it like $_SESSION['cart'][$productId] which holds the quantity so as you can see my get() and set() break down.
I currently have this for my new get()
/*
* #args: ...
* #return: mixed
*/
public function get() {
$keys = func_get_args();
$value = $_SESSION[array_shift($keys)];
foreach( $keys as $key ) {
$value = $value[$key];
}
return $value;
}
// This is how I use it then
$quantity = $session->get('cart', $productId);
It works with perfectly assuming the keys being search for do exist, otherwise it gives me a warning.
The problem now is the set() method. I want to do it in a similar fashion so any amount of keys can be given in the signature of the method and then the value to store but it is proving to be very confusing for me anyway.
Does anyone know how to accomplish this?
Thanks.

Answer 1

This should work:
class Session{
// $...
public function get(){
$keys = func_get_args();
if(count($keys) < 1){
// handle exception
}
$value = $_SESSION[array_shift($keys)];
foreach($keys as $key){
if(!isset($value[$key])){
// handle exception
}
$value = $value[$key];
}
return $value;
}
// $valueToSet, $...
public function set(){
$data = func_get_args();
if(count($data) < 2){
// handle exception
}
$val = array_shift($data);
$value = &$_SESSION[array_shift($data)];
foreach($data as $key){
if(!isset($value[$key])){
$value[$key] = array();
}
$value = &$value[$key];
}
$value = $val;
}
// $...
public function exists(){
$keys = func_get_args();
if(count($keys) < 1){
// handle exception
}
$tmp = array_shift($keys);
if(!isset($_SESSION[$tmp])) return false;
$value = $_SESSION[$tmp];
foreach($keys as $key){
if(!isset($value[$key])){
return false;
}
$value = $value[$key];
}
return true;
}
}
I can give you a little example:
$var = 'asdf';
$var_copy = $var;
$var_copy2 = &$var;
$var_copy = 'asdf2';
echo $var; // prints 'asdf'
$var_copy2 = 'asdf2';
echo $var; // prints 'asdf2'
And a little link from php.net