Headers Already Sent

**chadderuski** · 27 Apr 2011, 07:29 PM

I could use some help trying to track down this error:

[27-Apr-2011 12:46:08] PHP Warning: Cannot modify header information - headers already sent by (output started at /home/***/public_html/includes/templates/template_default/common/html_header.php:22) in /home/***/public_html/includes/functions/functions_general.php on line 45

I have spent many hours trying to find the culprit, and just cannot seem to find it. I have looked for the extra spaces before/after in all my header_php.php files to no affect. I've tried to reproduce the error browsing through my site and hitting all the major pages and still no go. Yet I still get 6 to 10 of these debug logs a day.

Yes, I have read the wiki entry on this, but those suggestions have not helped.

Zencart 1.3.9h

Thanks! Hope someone has an idea.

**haredo** · 27 Apr 2011, 07:50 PM

have you read this in the tutorial section..

https://www.zen-cart.com/tutorials/index.php?article=87

**chadderuski** · 27 Apr 2011, 08:59 PM

Originally Posted by haredo

have you read this in the tutorial section..

Yes, that's what I mistakenly called the wiki entry

**DrByte** · 28 Apr 2011, 12:30 AM

It means you've got something doing "output" on line 22 of /includes/templates/template_default/common/html_header.php

Moving this out of the Bug Reports section, since it's not a core bug of ZC.

**chadderuski** · 29 Apr 2011, 02:33 PM

Well, this IS an unmodified core file.

Line in question:

Could these error be produced by some form a hack/sql injection ???

These errors are occurring on a site without any user login, or checkout (royal industries inc <dot> com). I can browse through all the main pages of the site and NOT generate this error, yet I still get several of them every day. If I can't trigger the error myself, how am I ever going to track down the cause.

Some direction on what I need to do would be appreciated.

thanks

**haredo** · 29 Apr 2011, 02:41 PM

Use the free program called Winmerge to compare the two html_header.php files side by side.

You will compare the one that is on your server right now with one from the zen cart download file you are presently using..

This show any differences between the two files...

**chadderuski** · 29 Apr 2011, 03:20 PM

hi haredo,

yes, I've done this (but on the Mac I use Kdiff3 and DiffMerge).

I have in fact carefully check over all the files under /includes/modules/pages/*** pick a page ****/header_php.php

all to no affect.

**haredo** · 29 Apr 2011, 03:28 PM

May you can resolve the issue by thumbing through this thread..

http://www.zen-cart.com/forum/showthread.php?t=79162

**DrByte** · 29 Apr 2011, 04:20 PM

Okay, so maybe your problem isn't with header_php.php files nor html_header.php.

It's possible that you've customized something that's attempting to do a zen_redirect or is making a header() call from within a main_template_vars file or a template file, which will cause this sort of problem because you can't do a redirect like that once output has been sent to the page, and since html_header.php is where the output first starts (just as the error message says), it's just showing you a symptom, not a root cause.

So, since the header_php file load first, then html_header, and then the main_template_var files and then all the templating system, you need to focus in the latter sections.
Ref: http://www.zen-cart.com/index.php?ma...roducts_id=378

**chadderuski** · 29 Apr 2011, 05:22 PM

Hi Doc,

Thanks for the additional info. I had previously read this thread:

http://www.zen-cart.com/forum/showthread.php?t=79162

The final post about a blank line at the end of english.php sounds like what you are referring to. This is very possibly the issue, and one I hadn't considered. I have been working in some of these files, as well as several custom defined pages files (like the about_us page).

I did have a blank line at the end of my english.php file. I see in 1.3.9h that the closing ?> has been removed, but this is still in my code... perhaps I missed it or didn't consider it when merging files during my upgrade to 1.3.9h.

I'll check through all these carefully, and also read through the program flow documentation.

Thank you for the additional help and info. Nothing quite like having a "space" kick your arse for days on end!

Another customization that I did that may be related to this is forcing SSL on certain pages. But I have performed these on other sites without issue.

-cj

Originally Posted by DrByte

Okay, so maybe your problem isn't with header_php.php files nor html_header.php.

It's possible that you've customized something that's attempting to do a zen_redirect or is making a header() call from within a main_template_vars file or a template file, which will cause this sort of problem because you can't do a redirect like that once output has been sent to the page, and since html_header.php is where the output first starts (just as the error message says), it's just showing you a symptom, not a root cause.

So, since the header_php file load first, then html_header, and then the main_template_var files and then all the templating system, you need to focus in the latter sections.
Ref: http://www.zen-cart.com/index.php?ma...roducts_id=378

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