Cannot send session cookie - headers already sent by

cvargovargo

hi, i've got the following error

at all_in_one_seo_pack.php:693

which states

693 if($aioseop_options['aiosp_google_analytics_id'])
694 add_action('wp_footer', array($aiosp, 'aiosp_google_analytics'));

can anyone help me with what needs to be done here.
-Newb

bradgrafelman

Welcome to PHPBuilder!

While the error message in your post wasn't complete (I doubt it started with "at"), and while I can guarantee you're either looking at the wrong file or the wrong line number, the resolution is still the same:

You can't modify HTTP headers after they've already been sent, which is what will happen when you have any kind of output. So, move whatever code it is that might need to modify these HTTP headers to a location that occurs before any output (which includes any whitespace outside of <?php .. ?> tags).

cvargovargo

bradgrafelman;10997282 wrote:
Welcome to PHPBuilder!

While the error message in your post wasn't complete (I doubt it started with "at"), and while I can guarantee you're either looking at the wrong file or the wrong line number, the resolution is still the same:

You can't modify HTTP headers after they've already been sent, which is what will happen when you have any kind of output. So, move whatever code it is that might need to modify these HTTP headers to a location that occurs before any output (which includes any whitespace outside of <?php .. ?> tags).

can you tell me weather I even need to worry about php notices or just warnings?
also, that nature of my problem relates to wp e-commerce admin pages being slow...i sometimes get when opening an individual product

"A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete.

Script: http://mysite.com/wp-admin/load-scripts.php?c=1&load=jquery,jquery-ui-core,utils,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,editor&ver=b8c8048a2f3bc7ec132494f42f8c2001:127"

and I know I know, but when you say move whatever code it is that might need to modify headers....first i have no idea what code might need to modify headers and second, move to before any output including whitespace? like directly after <?php without any spaces? its so hard to follow any of this stuff, do you have any recomended resources to start to get a handle on this stuff.

-Thank you, thank you, thank you....
Chris

bradgrafelman

cvargovargo;10997284 wrote:
can you tell me weather I even need to worry about php notices or just warnings?

If no one needed to "worry about" notice-level messages, then they wouldn't even exist. 😉

cvargovargo;10997284 wrote:
also, that nature of my problem relates to wp e-commerce admin pages being slow...i sometimes get when opening an individual product

Actually, the nature of the problem you posted about has nothing at all to do with the "slowness" of anything at all. (And even if it did, note that "pages being slow" doesn't have any useful meaning, diagnostically speaking, since there are many different components between the user and the server that could introduce delays.)

cvargovargo;10997284 wrote:
"A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete.

Script: http://mysite.com/wp-admin/load-scripts.php?c=1&load=jquery,jquery-ui-core,utils,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,editor&ver=b8c8048a2f3bc7ec132494f42f8c2001:127"

Well that has nothing to do with PHP, since it sounds more like a Javascript error. Perhaps it's some sort of AJAX call that is waiting on a response from a PHP script, but it's pretty much impossible to say without looking at the line number referenced in the error message (127) and figuring out what's going on there.

cvargovargo;10997284 wrote:
first i have no idea what code might need to modify headers

Anything that sets cookies would be one example.

cvargovargo;10997284 wrote:
and second, move to before any output including whitespace? like directly after <?php without any spaces?

Well it doesn't have to be "directly after" the opening <?php tag, but it would definitely have to come before any PHP statements that generate output.

And note that the whitespace I was referring to is, again, any that is outside of the <?php .. ?> tags. For example, this code:


<?php
session_start();

// rest of script here...

will cause the 'headers already sent' error since there are at least two characters (the line breaks) that come before the opening '<?php' tag.

cvargovargo;10997284 wrote:
its so hard to follow any of this stuff, do you have any recomended resources to start to get a handle on this stuff.

The resource I use most often is my many years' worth of programming experience. Unfortunately, I can't really put that in a form that's tangible to anyone but me. :p

My second most-used resource would probably be the PHP manual.

After that, I guess I'd defer to the plethora of tutorials or even books that are available... but YMMV (greatly) depending upon the author and last updated date.