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

Question

My question might seem totally silly but I am really stuck here.
I know $_SESSION is a global variable but I can't seem to know how to retrieve the value it stores.
For example:
<?php
if(isset($_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.
Please, tell me how can I list out all the product names separating by a ,.
Any help will be greatly appreciated.
Thanks in advanced.
PS: I have already tried using implode() function.

Answer 1

for displaying all the product name separated by , use this code.
$allProductName = '';
$prefix = '';
foreach ($_SESSION["cart_products"] as $cart_itm)
{
$allProductName .= $prefix . '"' . $product_name. '"';
$prefix = ', ';
}
echo $allProductName;

Answer 2

Here's a edited version of your code
<?php
//you need to start session first
session_start();
$item = ["product_name" => "BMW", "product_code" => "540M"];
$list = array( $item, $item );
// Assuming you session list
$_SESSION[ "cart_products" ] = $list;
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>';
}
// to print names seperated by ','
$temp = "";
foreach ( $_SESSION["cart_products"] as $cart_itm ) {
$temp .= $cart_itm["product_name"] . ", ";
}
echo $temp;
}
// you cant print array using echo directly
print_r( $_SESSION["cart_products"] );
?>

Answer 3

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;