How to encrypt product ID in URL - php

Question

I have a database with just over 800 data.
product table
pid name p_page
1 money money.php
2 gold gold.php
3 .
. .
. .
800 .
I have 2 pages...
product_item.php
<div class="button">
View
</div>`
when you click view the product info is pass to product.php
in here i have
if (isset($_GET['pid'])) {
depending on what product the user clicked on the URL might look like something below but the 44 will change to whatever id
http://www.example.x10.mx/money.php?pid=44
the problem with this, is that money.php have a different layout to the other pages and if I change 44 to 68, the product info will show on the page but the layout will not look good.
My question
what is the best way for me to stop users from being able to change the url.
I want to encrypt all my pid in the url so it will look something like
http://www.example.x10.mx//money.php?sel=the product name here or 4 letters or anything
I just want to take away pid from the url.
Please help me. If you dont understand my question please ask in the comment and try and say what you think you understand.
Edited to show my fetch function
$php = "php/";
$apages = "account/";
$bpages = "booking/";
$gpages = "general/";
$ppages = "product/";
// Global functions
function fetchdir($dir)
{
$protocol = $GLOBALS['protocol'];
$host = $GLOBALS['host'];
($dir == $GLOBALS['apages'] || $dir == $GLOBALS['bpages'] || $dir == $GLOBALS['ppages'] || $dir == $GLOBALS['gpages'] ? $branch = $GLOBALS['pagebranch'] : $branch = $GLOBALS['branch']);
echo $protocol.$host.$branch.$dir;
}
Thanks
p.s. I dont know if this can be done in .htaccess but i think it can be done in php
Some clarification:
I have a url which looks like this
www.example.com/account/product.php?pid=1
the problem with this is that someone can change 1 or any number and if they is a pid in the database with that number it will get the items information and display on the page. Which I don't want to happen because not all product are meant to be display in some pages.
In the papge which i show all my available product. I simple uses a SELECT statement and then echo what I need in some div.
In that page I have a view button.
$stmt = $conn->prepare("SELECT * FROM Product WHERE Type = 'shoes'");
$stmt->execute();
$i = 0;
$rows = $stmt->fetchAll(PDO::FETCH_ASSOC);
foreach ($rows as $row) {
$id = ($row['pid']);
$product_page ($row['dir_page']);
<div class="button" >
<a href = "<?php fetchdir($apages) ?><?echo $product_page?ProdID=<?php echo $id>" > View</a >
</div >
}
Depending on the page that information is getting sent to when you click on view I use Get method
<?php
if (isset($_GET['pid'])) {
// Connect to the MySQL database
dbconnect();
$id = preg_replace('#[^0-9]#i', '', $_GET['pid']);
}
If you notice in my select statement used type to show only the product which type is shoes. I have other types as well, which as their other pages. Now the problem is if i change the pid to any page that doesn't have a type of shoes or if an in the other pages and enter a pid which type is shoes or anything, the information from that page will still render. Which I don't want to happen.
My question
how can i stop users from changing that pid and even if they change it. they will still be on the same page?

Answer 1

The problem isn't having the PID in the URL, it is having the template name in the URL.
Store the template name in the database (you are doing this already), and use that to determine what HTML to wrap the data in instead of putting it (money.php) in the URL.
Move your templates out of the web root (they shouldn't be hit by users directly), have a single index.php and then include() the template based on the data in the database.

Answer 2

You cannot prevent someone from changing the URL or from requesting arbitrary URLs. Your server (i.e. your app) has to decide how to respond to an invalid request. If you don't want to display certain things publicly, flag them as such in your database, test for that flag and simply refuse to output anything if that flag is hit.
Make the server respond negatively if something doesn't fit your conditions; don't expect the user to behave correctly.

Answer 3

Assuming that PID is a autoincrement value, you can still obfuscate it. Add another column in the table that contains a randomly-generated key (using uniqid or some derivative). Then use that key in your URL. You'll get something like: www.example.com/account/product.php?pid=II8GypI6H93Ij. This doesn't guarantee that someone won't find it, but it's good enough in most instances.

Answer 4

Check for allowance in the Database
Depending on your level of programming skills, in the database you could add a field or a relational table that relates the ID of the pages to allowed page templates (I'm guessing you're talking about templates.)
Then in the code you can make it so the page checks this database to see if the page contents are allowed to show. Something like:
$query1 = "SELECT * FROM Product WHERE Type = 'shoes' and allowedTemplate='1'";
This way you won't have to hardcode everything into the code itself. On the backend (if there is a CMS) then you could have checkboxes indicating the relationships to the templates and prefill them by default.
You'll need to make the site so something with that stuff though.
Your other option
You could use clean urls (which used to be better for SEO) to show real words instead of the IDs. Then you can use .htaccess tricks to convert the URIs to their ID counterparts with a dynamic RewriteMap.