[Phpmyadmin-devel] "Cannot modify header information" and strange character anomalies.

[Marc Delisle]

Marc Delisle a écrit :
> Derek Schaefer a écrit :
>> On Tue, Jul 14, 2009 at 3:10 PM, Marc Delisle<marc at infomarc.info> wrote:
>>> Derek Schaefer a écrit :
>>>> Hey all,
>>>>
>>>> I'm having a couple issues that I can't quite pin down. They aren't
>>>> show-stoppers by any stretch of the imagination, but they're still
>>>> something I need to work out before the end of the summer.
>>>>
>>>> I created a notification panel that displays the various structures
>>>> created or altered on import. To accomplish this I used the
>>>> PMA_Message::notice class to build a string of html, and then
>>>> ->display() it, as should be done, I believe. When this panel is
>>>> displayed, there are several warnings regarding not being able to
>>>> modify header information, header info. already sent, etc. I know what
>>>> this means and mostly understand how PHP handles headers, but I'm not
>>>> entire sure why it is throwing these errors. Upon a successful import,
>>>> there is a PMA_Message::success element displayed under the navigation
>>>> buttons that tells how many queries were executed, etc., and that
>>>> doesn't cause header problems. I imagine this is cropping up because
>>>> of how I am using PMA_Message, although I'm using it in ways
>>>> demonstrated elsewhere.
>>>>
>>>> Also, whenever the aforementioned notification panel is displayed,
>>>> strange character anomalies appear at the very bottom of the import
>>>> page. They change every time, but always take the form ",�<��Y". My
>>>> best guess is that it is related the the header issues, but until I
>>>> can get rid of them I can't know for sure.
>>>>
>>>> Here is a screenshot of the character anomaly and a couple of the
>>>> header backtraces:
>>>> http://downloads.moonlapse.org/pma/import_issues.jpg
>>>>
>>>> If anyone has some insight into these issues, I would greatly
>>>> appreciate any direction you could give.
>>>>
>>>> -Derek
>>> Are you sure there is not caused by some "echo" debugging statement you
>>> left in the code, or some misplaced blank line outside of the PHP tags?
>>> Also, if you comment out the calling of PMA_Message, you get rid of the
>>> warnings?
>> That was my first though, as I had left some around before I had
>> created the notification panel and they caused this same problem, but
>> I've searched for echo's, print_r's, printf's, etc. etc., and have
>> found nothing.
>>
>> No extra lines out side PHP tags.
>>
>> If I comment out the message section the problem goes away. (The
>> message section is in import.lib.php) Even if I just comment out the
>> display() call on the message the problem goes away.
>>
>>> The strange characters will disappear when your warnings disappear.
>>>
>>> Finally, does your code in branch/gsoc/derek produce this behavior?
>> Yes, it does, as it is an exact replica of my working copy.
>>
>>> --
>>> Marc Delisle
> 
> Tried with your branch on my test machine to replicate the error message 
> by clicking on Import (at the server level) and importing a short .sql 
> file containing a USE statement and a create table definition. I could 
> not see the warnings. Please describe the step-by-step.
> 
> Marc
> 

Ok, I guess I need to import XML, for example :)

-- 
Marc Delisle
http://infomarc.info