Display array elements in a specific way - php

Question

I am making a session based shopping cart system, and I need some help with displaying the array from the session. My array looks like this:
array(5) { [0]=> NULL [1]=> string(5) "TMRS1" [2]=> string(5) "TMRS2" [3]=> string(5) "TMRS1" [4]=> string(5) "TMRS3" }
I would like a script to count duplicate elements and display them.
For instance, TMRS1 would be set to $name1 (= TMRS1) and $quantity1 (= 2). The next item would then be $name2 and $quantity2 and so on.
Is this possible? You are more than welcome to post if you've got a better idea on how I can display the items in the cart. I just have to be able to pull some data from a database by using the name of the items, and then add up all the prices of the items :)

Answer 1

maybe you can use array_count_values()
example from php.net
<?php
$array = array(1, "hello", 1, "world", "hello");
print_r(array_count_values($array));
?>
The above example will output:
Array
(
[1] => 2
[hello] => 2
[world] => 1
)
With the array you give:
$shopping_cart = array("TMRS1","TMRS2","TMRS1","TMRS3");
$items_count = array_count_values($shopping_cart);
echo "Number of TMRS1 in the cart:".$item_count["TMRS1"];

Answer 2

This would leave you with an array with the data you need:
<?php
$tmrs = array(NULL, "TMRS1", "TMRS2", "TMRS1", "TMRS3");
foreach ($tmrs as $key => $val){
$duplicateArray[$key]['name'] = "TMRS" . $key; // only the name
$duplicateArray[$key]['quantity'] = (int) str_replace("TMRS", "", $val); // aquire only the value
}
print_r($duplicateArray);
?>
That would return:
Array
(
[0] => Array
(
[name] => TMRS0
[quantity] => 0
)
[1] => Array
(
[name] => TMRS1
[quantity] => 1
)
[2] => Array
(
[name] => TMRS2
[quantity] => 2
)
[3] => Array
(
[name] => TMRS3
[quantity] => 1
)
[4] => Array
(
[name] => TMRS4
[quantity] => 3
)
)
You could then output the name or the value like this:
<?php echo $duplicateArray[2]['name']; ?>