passing globals .. again!

filch

Hello,

As I am relatively new to PHP, and I am learning at a time when there is a lot of info both in books and on the internet, that spans the two methods of passing form globals between pages, I seem to be getting a bit confused. Especially when I try something that is supposed to be the way to do it properly and it still does not work. Below is some code that is simply supposed to take a product code and pass it to my shopping cart script. I have used bith what you see here ($HTTP_POST_VARS) and the $POST method. When I try to print it out on the target page it gives me nothing. I simply use echo "The item number is " . $POST['itemSku'];

Have I missed a comma. a brace .. the whole concept ... what? My server is set with the default register_globals off.

<?php display_button("products", "cart.php?itemSku=" . $HTTP_POST_VARS[$row_displayCatProd['itemSku']] . "", "add-to-cart", "Add ".$row_displayCatProd["itemName"]." To My Shopping Cart");?>

Here is the code for the function display_button;

function display_button($page, $target, $image, $alt)
{
//echo "The target page is $target";
	if($page=="products")
    	echo "<center><a href=\"$target\"><img src=\"assets/images/mini-"."$image".".gif\" 
           alt=\"$alt\" border=0 height = 10 width = 110></a></center>";
	else
		echo "<center><a href=\"$target\"><img src=\"assets/images/$image".".gif\" 
           alt=\"$alt\" border=0 height = 24 width = 107></a></center>";
}

This function simply displays the proper button with the links attached.

Any help and patience is appreciated.

Cheers

Dave

notionlogic

I simply use echo "The item number is " . $_POST['itemSku'];

But you're passing the variable through in the URL which means you need to use GET not POST 🙂

filch

Hummm ... I have tried $_GET and that never worked either. Must keep digging here. Maybe I have screwed up some code somewhere.

Cheers

Dave

filch

In trying to get to the bottom of this and to understand the whole super global thing, I decided to just simplify my code down to the basics and observe how this all works. So I created a form on a page called send.php and added a text input box called 'info'.

I then submitted this page to another page called receive.php that had the following code:

<?php 

if (isset($_POST['info']));
  echo "The info is \"" . $_POST['info'] . "\""; ?>

This worked fine from the form. I then added a link on the send.php page like so:

<?php

$info = "this is info from page link"; 
echo "$info";
?>
<p><a href="receive.php?info=" .<?php $HTTP_POST_VARS['info']; ?> ." >Go 
    to next page</a></p>

I have tried this with $_GET as well. This does not work. What am I doing wrong?

Cheers

Dave

diego25

Ok, first of all,
<?php $HTTP_POST_VARS['info']; ?>
isn't doing anything. You are not printing or echo'ing it.

Second of all, if you add that to send.php, the variable will be undefined! The reason is because $HTTP_POST_VARS will have the variables AFTER a form is submitted. But send.php has the form, which hasn't been submitted yet, so $HTTP_POST_VARS won't have anything.

Diego

filch

What about the fact that I initialized the variable $info? I just happen to have the form and the link on the same page but $info has a value.

Dave

diego25

Yeah, $info will have a value, but $HTTP_POST_VARS['info'] won't. They are not related in any way...

Diego

filch

OK ... obviously I am not grasping the concept. Can you tell me, or direct me to some clear info as to how I can:

A: pass values from one page to another while not using a form.

B: Pass values from one page to another while not having the info show up in the URL. Do I have to use session vars?

Sorry to be so dull. I have a mental block on this for some unknown reason. Grrrr

Dave

diego25

You should define what "page" is. Is it a PHP script? Is it just a plain HTML file?

Anyway, I'll assume it is a PHP script...

A: cookies, query string, session vars...

B: Form, cookie, sessioon vars...

Diego