I have var_dump a variable and it is empty - php

Question

I want to know the reasons why this variable is passing empty.
<form action="cart.php" method="POST">
<input style="width:10px; margin-left:9px; " name="price[]" type="checkbox" value="' . $variety['price'].'_'. $variety['variety']. '_'. $product['name'] . ' " /></form>
Can you see $product['name'] how can I print the it's value after extracting it's values in cart.php as
extracts values
list($aDoor, $variety,$productname) = split('_', $_POST['price']);
$aDoor = array();
$variety = array();
$productname= array();
foreach ($_POST['price'] as $p)
{
list($a, $b,$c) = explode('_', $p);
$aDoor[] = $a;
$variety[] = $b;
$productname[] = $c;
}
Now below the foreach loop how can I echo the print of productname once..?

Answer 1

foreach($productname as $name) {
echo $name . '<br />';
}
or if you want to associate the product names with their other values in $aDoor and $variety you could do:
foreach($productname as $index => $name) {
echo 'Name: ' . $name . '<br />';
echo 'Variety: ' . $variety[$index] . '<br />';
echo 'Price: ' . $aDoor[$index] . '<br />';
}
EDIT:
If I can take your comment to mean that all of the names are the same in the $productname array then you can do this instead:
if(count($productname) > 0) {
echo 'Product Name: ' . $productname[0] . '<br />';
foreach($variety as $index => $name) {
echo $name . ': $' . $aDoor[$index] . '<br />';
}
}

Answer 2

Now below the foreach loop how can I
echo the print of productname once..?
print_r ($productname);
But if you want to see each value of product name inside the loop:
foreach ($_POST['price'] as $p)
{
list($a, $b,$c) = explode('_', $p);
$aDoor[] = $a;
$variety[] = $b;
$productname[] = $c;
echo $c . '<br />'; // show product name
}
Also, i don't see your echoing this line of code with php:
<input style="width:10px; margin-left:9px; " name="price[]" type="checkbox" value="' . $variety['price'].'_'. $variety['variety']. '_'. $product['name'] . ' " /></form>
in which case this is not how to show value in above line:
value="' . $variety['price'].'_'. $variety['variety']. '_'. $product['name'] . ' "
instead you need to wrap it in php tags:
value="<?=$variety['price'].'_'. $variety['variety']. '_'. $product['name']?>"

Answer 3

As I stated in another of your questions, you cannot use split() on an array. You're forcing PHP to treat $_POST['price'] as an array by naming it "price[]" in your form. WHen you split on an array:
$arr = array('a', 'b', 'c');
list($a, $b, $c) = split($arr);
you end up with the following:
$a = 'Array';
$b = NULL;
$c = NULL;
You will have to do the following:
list($aDoor, $variety,$productname) = explode('_', $_POST['price'][0]);
^^^ (note the array notation)
You're also not creating a $product variable in your extractions cript. You are creating a $productname array, but $productname is not the same as $product['name']