Need help searching existing array elements

[g7ibby]

Hello all.
I don’t even know where to start with this one.
I’m in process of finishing a cart script and I am having trouble figuring out how to get the "add to cart" script to check to see if an item exist before adding a new item to an array.

Currently the item is passed through variables to the add_cart.php page. The add cart page then sets and adds a variable for quantity to 1, adds all of the variable to an array that is placed into the session, before moving on to the show cart page.

What I need to do is have to script search for a existing ID that matches what the new item is and only increment the qty variable of the array.

Here are the variables being passed
$id
$item_name
$price

And here is my code for adding to the basket array.

	if ($add_item)
	{
	$qty = 1;
	$t_price = ($qty * $price);
	$_SESSION['basket'][] = array (	 id => "$id",
									 item_name => "$item_name",
									 price => "$price",
									 qty => "1",
									 t_price => "$t_price");
	}

As I said I don’t know where to start with this one. I haven’t found anything relating editing arrays yet but answering this should help me figure out on my own on how to delete a line from the array by id, and changing a quantity. Both of those being accessible by the basket view page.

Any help is greatly appreciated.
G

[YappyDog]

Sounds like you could use the in_array function to check to see if it is there before adding an item.

http://us2.php.net/manual/en/function.in-array.php

[g7ibby]

That seems like the ticket.
I can get that to work with a simple array but not while the multi-array as seen below. How do you specify what key to search?

$foo = array(
             array("item_num"=>"abcd",
                   "qty"=>"1"),
             array("item_num"=>"efgh",
                   "qty"=>"3")
             );

print_r($foo);
$x = "abcd";
if (in_array ($x, $foo))
	{print ("<br><b>$x</b> is in there");}
else	{print ("<br>I cant find <b>$x</b>");}

Thanks for the reply
G

[g7ibby]

I gave the following code a shot as I read further into the manual and im getting a error that says
Wrong datatype for first argument in call to in_array in

I tried to specify the key name and the array and have gotten just errors. Im pretty stuck from here.
Any other ideas?

$foo = array(
             array("item_num"=>"abcd",
                   "qty"=>"1"),
             array("item_num"=>"efgh",
                   "qty"=>"3")
             );

print_r($foo);

if (in_array(array ('[item_num] => abcd'), $foo))
	{print ("<br>Its in there");}
else	{print ("<br>I cant find it");}

G🙁

[g7ibby]

Issue was solved by changing the way the arrays are saved into the session then using array_key_exists("basket", $SESSION). The items are also now given a named key of their unique item numbers. This gives the function something more concrete to look for. The array flow is $sesson[basket] [item id]. Since array_key_exists will spit out a warning if $basket is totally empty I first check to see if $basket even exist. If it doesn't there are no quantities to modify anyway so we go right to adding the item in. If basket does exist then there has to be at least one item in the basket and this gives array_key_exists something to do and wont spit an error out. array_key_exists looks for the item id and if it exist it will increment the quantity by one and if the id does not exist in the array but there are other items in the cart we just add a new item.

He is the working code for use or comments/critisisim. (constructive i hope)

if ($add_item)//making sure page was accessed by a item link
	{
	if (array_key_exists("basket", $_SESSION))//checking if the there is a basket to search ids in
		{
			//looking to see if the item already exist in the basket
			if (array_key_exists("$id", $_SESSION[basket]))
			{
		//next section increments the qty for the item because its already exists
			$qty = ($_SESSION[basket][$id][qty]);//setting qty value to qty variable
			$price = ($_SESSION[basket][$id][price]);// getting unit cost
			$qty++;//adding 1 to qty
			$t_price = ($qty * $price);//recalculation total cost
			$_SESSION[basket][$id][qty]=$qty; //putting qty back into array
			$_SESSION[basket][$id][t_price]=$t_price; //putting total price back into array
			}
			//if the id is not found just add a new item to the array and set the qty to 1
			else
			{$qty = 1;
			$t_price = ($qty * $price);
			$_SESSION[basket][$id] = array (	id => "$id",
												item_name => "$item_name",
												price => "$price",
												qty => "$qty",
												t_price => "$t_price");
			}
		}
		else//there is not a basket present we create it and add the first item
		{$qty = 1;
		$t_price = ($qty * $price);
		$_SESSION[basket][$id] = array (	id => "$id",
											item_name => "$item_name",
											price => "$price",
											qty => "$qty",
											t_price => "$t_price");
		}


}	
else 	
{ echo "No item to add";}

Thanks YappyDog for at least getting me into the right ball park.

G