Need help with cURL!

[sas789]

OK here goes.

There are three files:

1. confirm.php

2. authorize.php

3. notify.php[/list=1]This application allows a youth group leader to pay for their entire group's admission to our College Days event. This way, he/she doesn't have to enter their credit card information separately for each student.

   Each student's name goes into $SESSION['studentnames']. The total count is represented by $SESSION['studentcount'].

   confirm.php sends each student as a unique hidden form field to authorize.php, via the following code:

   $names = $_SESSION['studentnames'];
   for ($i = 0; $i < $_SESSION['studentcount']; $i++)
     {
     $j = $i + 1;
     echo "<input type=\"hidden\" name=\"student$j\" value=\"$names[$i]\" />\n";
     }

   I know this works, because "View Source" of confirm.php shows the following:

   <input type="hidden" name="student1" value="John Smith" />
   <input type="hidden" name="student2" value="Jane Doe" />
   <input type="hidden" name="student3" value="Lisa Johnson" />

   So far, so good. Now we're in authorize.php where the troubles begin. This file uses cURL to send each form field as a URL post to Authorize.net's gateway, using the standard "ampersand fieldname equals value" format. The code that constructs this URL looks like this:

   $fields .= "&x_login=$x_login&x_tran_key=$x_tran_key"; // etc.

   [$x_login and $x_tran_key were defined previously, which is why the variable name is used instead of an actual value.]

   Of course, I have to add on each student. This part, I think, is the problem. I'm using the following code:

   for ($i = 0; $i < $count; $i++)
     {
     $j = $i + 1;
     $fake = "student$j";
     $fields .= "&".$_POST[$fake]."=$".$_POST[$fake];
     }

   Authorize.net's gateway receives this post and relays it to notify.php, which uses virtually the same code chunk to echo a list of students in an email sent to the leader:

   for ($i = 0; $i < $count; $i++)
     {
     $j = $i + 1;
     $fake = "student$j";
     $message .= "$_POST[$fake]\n";
     }

   An actual email, copied below, demonstrates that while the variable $count (which is transmitted in the post URL) went through, the student names did not:

   ---

   You have paid for the following student(s) to attend Spring College Days:

   Total amount: $55.00

   [As you can see, the email contains line breaks - indicating that the code chunk executed, but the student variables were not transmitted.]

   Any ideas?

[AstroTeg]

I dunno about you, but this always makes me nervous:

  $fake = "student$j";
  $fields .= "&".$_POST[$fake]."=$".$_POST[$fake]; 

When this really could have been written as:

  $fields .= 'Student ' . $j . ' = ' . $_POST['student' . $j]; 

Or even better, rewrite your last for loop as:

for ($i = 1; $i < $count + 1; $i++)
  $message .= $_POST['student' . $i] . "\n";

You're attempting to do some variable of variable stuff which definitely can be done, but it tends to be more complex and requires more work to troubleshoot.

[sas789]

Thanks AstroTeg for your help. Turns out there was more involved, but you helped me to see part of the problem. Anyway, it works now.

Cheers