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• Paustian
  
  

  • Rank: Softmore
  • Registered: May 30, 2005
  • Last visit: May 31, 2010
  • Posts: 340

  Posted: Feb 25, 2006 - 08:52 AM

  I have run into something really strange. pnRedirect is failing to redirect and instead is giving me a blank white page. Here is some example code that fails in the module.
  
  

  Code

  function Exams_admin_test()
  {
      pnRedirect(pnModURL('Exams', 'admin', 'viewitems'));
      return true;
  }

  
  
  Redirects will work in other modules, but not in this one. Any ideas?

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• Topiatic
  
  

  • Rank: Expert
  • Registered: Nov 23, 2003
  • Last visit: Dec 13, 2009
  • Posts: 1487

  Posted: Feb 25, 2006 - 09:09 AM

  Try

  Code

  return pnRedirect(pnModURL('Exams', 'admin', 'viewitems'));

  
  
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  Under Construction!

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• **unknown user**
  
  

  • Rank: Registered User
  • Registered: Mar 16, 2002
  • Last visit: Oct 21, 2009
  • Posts: 17

  Posted: Feb 25, 2006 - 10:40 AM

  I had the same problem earlier.. another problem can be that the headers are already sent
  
  

  Code

  if (headers_sent()) {
      echo 'headers are already sent';
  } else {
      return pnRedirect(pnModURL('Exams', 'admin', 'viewitems'));
  }

  
  Headers will be sent if you for example echo something (http://www.php.net/headers_sent)

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• Paustian
  
  

  • Rank: Softmore
  • Registered: May 30, 2005
  • Last visit: May 31, 2010
  • Posts: 340

  Posted: Feb 25, 2006 - 03:54 PM

  Yep, that is it. Headers are being sent. Thanks Hunkpapa, now I have to figure out what is writing text out. I have some require_once statements in my code, and from reading other posts, that maybe a problem.

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• Paustian
  
  

  • Rank: Softmore
  • Registered: May 30, 2005
  • Last visit: May 31, 2010
  • Posts: 340

  Posted: Feb 25, 2006 - 04:25 PM

  I'm stumped. I completely deleted the file this code was in, pnAdmin.php and added the following as the file
  
  

  Code

  <?php
  function Exams_admin_test()
  {
      if (headers_sent()) {
              echo 'headers are already sent';
      } else {
              pnRedirect(pnModURL('Exams', 'admin', 'viewitems'));
              return true;
      }
      //return pnRedirect(pnModURL('Exams', 'admin', 'viewitems'));
  }
  ?>

  
  
  When I try to load the function using the following URL
  
  http://localhost/microtextbook/index.php?module=Exams&type=admin&func=test
  
  I get the message,
  
  headers are already sent.
  
  Any ideas?

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• AbraCadaver
  
  

  • Rank: Expert
  • Registered: Aug 20, 2002
  • Last visit: Jan 12, 2010
  • Posts: 1219

  Posted: Feb 25, 2006 - 04:36 PM

  Do you maybe have a space or carriage return before the opening

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• Simon
  
  

  • Rank: Legend
  • Registered: Dec 11, 2002
  • Last visit: Oct 21, 2009
  • Posts: 11674

  Posted: Feb 25, 2006 - 08:41 PM

  Only a few topics down from this one we've already been through all the reasons for pnRedirect failing ;)
  
  http://forums.postnuke.com/index.php?name=PNphpBB2&file=viewtopic&t=47031
  
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  birtwistle.me.uk - Personal Blog
  
  
  Please read the Support Guide

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• Paustian
  
  

  • Rank: Softmore
  • Registered: May 30, 2005
  • Last visit: May 31, 2010
  • Posts: 340

  Posted: Feb 26, 2006 - 07:21 AM

  Hammerhead,
  
  Thanks. I had already seen that thread, but none of the suggestions helped. Anyhow, I was alble to solve the problem by reading up a bit on headers_sent(). It turns out there are two optional parameters that are very useful for tracking down this sort of problem. Here is the code I used
  
  

  Code

  function Exams_admin_test()
  {
      if (headers_sent($filename, $linename)) {
              echo "headers are already sent in $filename at $linename";
      } else {
              pnRedirect(pnModURL('Exams', 'admin', 'viewitems'));
              return true;
      }
  }

  
  
  This pointed to my pnTables.php file. I had some extra return characters after the closing ?> at the end of the file. Elimination of these fixed the problem.
  
  Thanks to everyone who helped on this. BTW, Andreas and I are almost finished with a major upgrade of the Exams module.

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• Simon
  
  

  • Rank: Legend
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  • Posts: 11674

  Posted: Feb 26, 2006 - 07:56 AM

  Glad you found the problem
  
  --
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  birtwistle.me.uk - Personal Blog
  
  
  Please read the Support Guide

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• AbraCadaver
  
  

  • Rank: Expert
  • Registered: Aug 20, 2002
  • Last visit: Jan 12, 2010
  • Posts: 1219

  Posted: Feb 26, 2006 - 10:07 AM

  AbraCadaver

  Do you maybe have a space or carriage return before the opening

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• AmmoDump
  
  

  • Rank: Team Member
  • Registered: Dec 07, 2003
  • Last visit: May 09, 2010
  • Posts: 2703

  Posted: Feb 26, 2006 - 10:21 AM

  Whats the deal with the carriage returns... how do they affect the interpreter??
  
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  David Pahl
  Zikula Support Team

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• Simon
  
  

  • Rank: Legend
  • Registered: Dec 11, 2002
  • Last visit: Oct 21, 2009
  • Posts: 11674

  Posted: Feb 26, 2006 - 10:41 AM

  Anything outside of PHP tags is treated as HTML source code, and therefore is sent to the browser (even if it is just empty line returns). You can't send headers to the browser if you've already sent it HTML content, so blank lines at the end of files cause the header function to fail.
  
  --
  itbegins.co.uk - Zikula Consulting
  
  birtwistle.me.uk - Personal Blog
  
  
  Please read the Support Guide

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• AmmoDump
  
  

  • Rank: Team Member
  • Registered: Dec 07, 2003
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  • Posts: 2703

  Posted: Feb 26, 2006 - 11:56 AM

  Really, even though the the file has a .php extension... it defualts to HTML outside the PHP tags... interestng... I did not know that...
  
  /me rethinks problems from the past.
  
  /me learns something today...
  
  /me thought I was just partying with the wife today....
  
  --
  David Pahl
  Zikula Support Team

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• AmmoDump
  
  

  • Rank: Team Member
  • Registered: Dec 07, 2003
  • Last visit: May 09, 2010
  • Posts: 2703

  Posted: Feb 26, 2006 - 11:58 AM

  ...but carriage returns have no purpose outside the

   tag...??
  
  
  
  /me still wonders...
  
  
  
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  David Pahl
  
  Zikula Support Team

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• Simon
  
  

  • Rank: Legend
  • Registered: Dec 11, 2002
  • Last visit: Oct 21, 2009
  • Posts: 11674

  Posted: Feb 26, 2006 - 08:24 PM

  The PHP parser is always in HTML mode until it his a

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