question about in_cart() function,

I'm trying to trouble shoot some code in my new observer class. this is my first time out using the observer class and i've gone thru the 2 tuts in the wiki.

i'm trying to check for the presence of certain products (hazmat) in the cart. and if there, create a ```php
$_SESSION['hazMatOneInCart'] = TRUE

orig i have a var based on a specific product id -
var $hazMatProdOne = 115;

and then ran like below - 

```php
function update(&$class, $eventID, $paramsArray = array()) {
	 if($_SESSION['cart']->in_cart($this->hazMatProdOne)) {
		//echo 'has HazMat One';
		$_SESSION['hazMatOneInCart'] = TRUE;
	} 
}

didn't seem to be working, and then, for testing purposes when i switched out the var $hazMatProdOne to an integer, 115 (a product id) and got an error -

function update(&$class, $eventID, $paramsArray = array()) {
	 if($_SESSION['cart']->in_cart($this->115)) {
		$_SESSION['hazMatOneInCart'] = TRUE;
	} 
	
}

never mind, i see the problem

$this->155
``` is wrong, 
instead, 
```php
$this->shouldBeAVar

Or just 115 instead of $this->115

hey Dr.Byte, yes i caught after i posted, thanks

for some reason i cannot get this in_cart() function to return true even though i have product 115 in the cart. not sure what to do?

function update(&$class, $eventID, $paramsArray = array()) {
if($_SESSION['cart']->in_cart(115)) {
$_SESSION['hazMatOneInCart'] = TRUE;
//echo 'has HazMat One';
}
} //doesn't return true

however, below does work. meaning the other parts of the code not listed here are working. how can i trouble shoot this?

function update(&$class, $eventID, $paramsArray = array()) {
if(true) {
$_SESSION['hazMatOneInCart'] = TRUE;
//echo 'has HazMat One';
}
}

getting discouraged here. not sure how to get that to test as true,
i'll include more code here in case that helps to clarify. the autoloaders are working.

function hazMatProduct() {
    $_SESSION['cart']->attach($this, array('NOTIFIER_CART_ADD_CART_END', 'NOTIFIER_CART_REMOVE_END'));
}

function update(&$class, $eventID, $paramsArray = array()) {
global $cart;
if($_SESSION['cart']->in_cart(115)) {
//if(TRUE) {   //this works
        $_SESSION['hazMatOneInCart'] = TRUE;
    }
}
}

are there any more tuts available on using the observer class? i've done the two in the Developers WIKI -
the prod id 115 is just for testing, will be changed to a variable once i figure out problem here

tcarden:

thanks, unfortunately it doesn't do anything.

getting discouraged here. not sure how to get that to test as true,
i'll include more code here in case that helps to clarify. the autoloaders are working.

function hazMatProduct() {
$_SESSION['cart']->attach($this, array('NOTIFIER_CART_ADD_CART_END', 'NOTIFIER_CART_REMOVE_END'));
}

function update(&$class, $eventID, $paramsArray = array()) {
global $cart;
if($_SESSION['cart']->in_cart(115)) {
//if(TRUE) { //this works
$_SESSION['hazMatOneInCart'] = TRUE;
}
}
}

> 
> are there any more tuts available on using the observer class? i've done the two in the Developers WIKI -
> the prod id 115 is just for testing, will be changed to a variable once i figure out problem here
How about this:

function hazMatProduct() {
$this->attach($this, array('NOTIFIER_CART_ADD_CART_END', 'NOTIFIER_CART_REMOVE_END', 'NOTIFIER_CART_UPDATE_QUANTITY_END'));
}

function update(&$class, $eventID, $paramsArray = array()) {
$_SESSION['hazMatOneInCart'] = ($class->in_cart(115)) ? true : false;
}

in_cart() works on the complete product-id value. And if you've got attributes on the product, the hash code after the main product number is also part of the in_cart() search.

So, if the product-id assigned by the cart after selecting attribute combinations is 115:58203828a348f838e8f8d8c then testing in_cart(115) will fail.

Instead, you'll need to get $_SESSION['cart']->get_products() into a variable, and then loop through the array of products dumped into that variable, and find a match on the number you're looking for, perhaps using (int) to force the removal of the hash when doing your comparison. (Can't use (int) on the parameters to in_cart() calls because that's going the opposite direction to what you're seeking.)

You could also try:

[B]$_SESSION['cart']->in_cart_check('products_id','115')[/B]

which will do all the extra code of looping through the results of the $_SESSION['cart']->get_products() without the check of attributes ...

excellent, thanks!,
extremely helpful..

just call me Mr. HazMat

Ajeh:

You could also try:

[B]$_SESSION['cart']->in_cart_check('products_id','115')[/B]

> which will do all the extra code of looping through the results of the $_SESSION['cart']->get_products() without the check of attributes ...
Yup, that'll work too.

lat9:

How about this:

function hazMatProduct() {
$this->attach($this, array('NOTIFIER_CART_ADD_CART_END', 'NOTIFIER_CART_REMOVE_END', 'NOTIFIER_CART_UPDATE_QUANTITY_END'));
}

function update(&$class, $eventID, $paramsArray = array()) {
$_SESSION['hazMatOneInCart'] = ($class->in_cart(115)) ? true : false;
}

There's one more place where a hazMat product could "sneak" into the cart .. when a customer's cart is restored from a previous login; you'll need to add 'NOTIFIER_CART_RESTORE_CONTENTS_END' to the list of notifiers that you attach to. Combining that with Ajeh's suggestion yields:

function hazMatProduct() {
$this->attach($this, array('NOTIFIER_CART_ADD_CART_END', 'NOTIFIER_CART_REMOVE_END', 'NOTIFIER_CART_UPDATE_QUANTITY_END', 'NOTIFIER_CART_RESTORE_CONTENTS_END'));
}

function update(&$class, $eventID, $paramsArray = array()) {
$_SESSION['hazMatOneInCart'] = ($class->in_cart_check('products_id', '115')) ? true : false;
}

thanks lat9, am adding your code now.

maybe i'll have a decent plugin or add-on to contribute when this is all done.

regards,
Mr. HazMat

Ajeh:

You could also try:

[B]$_SESSION['cart']->in_cart_check('products_id','115')[/B]

> which will do all the extra code of looping through the results of the $_SESSION['cart']->get_products() without the check of attributes ...
Bump/+1 Thanks Ajeh I was running into this issue as well.

Perhaps the core functionality of the $_SESSION['cart']->in_cart() should be changed to work as per Ajeh's suggestions? It seems to me a pretty big gap to not include products with attributes in the in_cart() function.

For Google Indexing: (I searched for these)
How do I figure out if a product has been added to cart
zen cart detect add to cart function
zen-cart check if product add to cart
zen-cart.com detect added to cart

There's also a closed thread from 2010 that's more visible in the Search Engines that should be linked to this solution: <http://www.zen-cart.com/showthread.php?146750-Already-in-Cart-code-sometimes-works>