Bug #13933 Updated: error_log and HTTP redirect using header conflict
ID: 13933
Updated by: zak
Reported By: bonseb@free.fr
Old Status: Open
Status: Assigned
Bug Type: Output Control
Operating System: Windows NT4 SP6
PHP Version: 4.0.6
Old Assigned To: zak
Assigned To: yasuo
New Comment:
Assigning this to Yasuo :)
Previous Comments:
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[2001-12-12 04:51:21] yohgaki@php.net
Zak, is this bug analyzed?
I'm trying to sort out output buffering problems.
Thanks.
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[2001-12-10 20:40:37] zak@php.net
Assigning it to myself so that I don't forget about it. :)
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[2001-12-05 04:24:00] bonseb@free.fr
I finally found time to test. Here it goes.
First of all, PHP config is:
error_log is not set
display_errors is off
log_errors is on
error_reporting is standard (E_ALL & ~E_NOTICE)
Then, the page I'm testing:
<?
error_log ("this is a test", 0);
header("Location: index.php");
?>
And finally, the results:
- in Apache's log file, I get these two lines:
[Wed Dec 05 10:09:59 2001] [error] [client 172.22.50.91] this is a test
[Wed Dec 05 10:09:59 2001] [error] [client 172.22.50.91] PHP Warning: Cannot add header information
- headers already sent in d:\wwwroot\htdocs\csf_recette\titi.php on line 3
- the source of the generated page displayed in IE is as follow, eventhough nothing has been output:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=iso-8859-1"></HEAD>
<BODY></BODY></HTML>
Conclusion:
- error_log works fine, it does what I expect, but it might do a little more;
- PHP complains about something being output *before* the call to header. I've tried removing
this call (to header), my message is logged, and I *still* get the same output;
- thus, somehow, the call to error_log produces PHP or Apache to generate this unexpected HTML code
while logging;
I've tried almost the same settings on another server (difference in php.ini is display_errors
on) and it works quite fine.
Could there be other parts of PHP's configuration, or even Apache's conf, altering the
expected behaviour ?
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[2001-11-12 19:54:19] sniper@php.net
Status -> feedback (Zak! try to remember? :)
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[2001-11-12 17:01:23] zak@php.net
Sounds like error_log() was generating an error message
because the error_log directive was not set. Once the
error message was generated, output would be sent to the
browser, causing the headers to be sent and the header()
call to fail.
Try unsetting the error_log directive in php.ini and run a
script that only calls error_log().
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