String from an array from an array from the database - php

Question

Okay so, first of all, I searched through the www for this question, and I found some question related to arrays but not exactly to mine.
Okay so as you may know, paypal only allows one custom variable to be $POST but I need to gather the product id AND the quantity of the item bought. So to do this I made my custom variable into something that would get the post like (25-1,12-3,13-4) it means, the user bought 3 items(separated by commas), where the first number is the product id (then the separator '-' comes in) and the second one is the quantity. (so they're all in the same row and column)
Now my problem is displaying it from the database. I need to get the product name and details that's why I need to separate the numbers from each array as a string and fetch the data from the database for the information of the product. (I'm using an older version of php anyway, 5.2, I guess.)Now the problem is:
1.) It returns the word 'Array' (literally) so it would say like ArrayArrayArray
2.) How do I explode/separate those data so I can get it because I need the product ID to fetch some other data... I tried exploding it into array, then exploding it again but doesn't work (most likely my code is wrong?)
Here is my code: (I've already connected to the database)
$data = mysql_query("SELECT * from transactions") or die(mysql_error());
/* My table tag and headers goes here */
while($info = mysql_fetch_array( $data )) {
echo "<tr>";
echo '<td>' . $info['id'] . '</td>';
echo "<td>";
$array = $info['product_id_array'];
$explode_array = explode(",", $array);
foreach($explode_array as $explode_more){
$explode_more = explode("-", $explode_array);
$prod_id = $explode_more[0];
$quantity = $explode_more[1];
print_r($prod_id); //should echo the 25 in the array (25-1), right?
print_r($quantity);
}
echo"</td>";
echo"<tr>";
}
If only paypal would allow multiple custom variables T_T Thank you guys. Forgive me if I can't express my question very well or my language is not good, as english is not my first language :), Good day!

Answer 1

Your variable names are mixed up. Inside the foreach-loop, you should do something like this
foreach($explode_array as $explode_more){
$explode_even_more = explode("-", $explode_more);
$prod_id = $explode_even_more[0];
$quantity = $explode_even_more[1];
print_r($prod_id); //should echo the 25 in the array (25-1), right?
print_r($quantity);
}
Note, that $explode_more is used inside the loop and $explore_array is left as is.

Answer 2

Separate this in multiple tables, never store non-atomic values in 1 column.
Certainly not when they have relation with another table.
Suppose you want to know the sales from a certain product in some period.