php - Retrieve value from $_SESSION and output using another variable

Question

I know $_SESSION is a global variable but I don't know how to retrieve the value it stores.

For example:

<?php
if(isset($_SESSION["cart_products"]))
{
    foreach ($_SESSION["cart_products"] as $cart_itm)
    {
        //set variables to use in content below
        $product_name = $cart_itm["product_name"];
        $product_code = $cart_itm["product_code"];
        
        echo '<p>'.$product_name.'</p>';
        echo '<p><input type="checkbox" name="remove_code[]" value="'.$product_code.'" /></p>';
    }
}

echo $_SESSION["cart_products"];
?>

Here you can see, the $_SESSION["cart_products"] holds some value (information like product name, product code etc). Now, the problem is that I just want to echo out all the product names that are stored in $_SESSION["cart_products"].

Since it's a cart list, it contains more than one product details. But, when I echo out $product_name, it only shows the name of the last product in the list. And echoing out $_SESSION["cart_products"] gives array to string error.

How can I list out all the product names separating by a ,?

I have already tried using the implode() function.

Answer 1

Finally, I got the answer to my query with the help of @Christophe Ferreboeuf. However, some modification was still needed.

Here's the corrected code:

$allProductName = '';
 $prefix = '';
 foreach ($_SESSION["cart_products"] as $cart_itm)
{
    $allProductName .= $prefix . '"' . $cart_itm["product_name"]. '"';
    $prefix = ', ';
}
echo $allProductName;