Why does Checkout Button Url string substitutes ampersand for question mark?

I recently ran the eCart checkout wizard and was testing the site. When I click on the Checkout Button it would take me to a "page not found" error. I realized that the url string showed checkout.php&13=13. When I changed the ampersand to a question mark (physically in address bar) it works. In the page where the checkout button is the form action is <form action="<?php echo ($_SERVER["PHP_SELF"].(isset($_SERVER["QUERY_STRING"])?"?".htmlentities($_SERVER["QUERY_STRING"]):""));?>" method="post" >. I have no idea where the ampersand is coming from.

sends a link where i can see the problem please and steps to reproduce.

Go to http://www.promotables.com/Product_Pages/Acrylics_Results.php and add a product to the cart. On the cart page click the checkout button.

looking at the source code, it looks right, can you send a copy of the page so i can see the php code.

Please see attached.

looks like the code for the checkout redirect is not executing correctly for some reason, I'll need to troubleshoot directly, see the private message section.

Please see private message.

what version of eCart are you using?

I corrected the probelm by changing line 47:

if (strpos($Redirect_redirStr, "?") < 0)     {

to:

if (strpos($Redirect_redirStr, "?") === false)     {

in looking at checkout pages created with the current 5.0.7 version, it uses the syntax that i changed the code to. If you are using a previous version, i suggest upgrading to the newer one.

Interesting. I am using 5.0.7. I allow the possibility that that particular page was created earlier than the upgrade. Thanks again Jason. Don't know what I'd do without you!