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Posted by Rik on 08/23/06 11:01
Schraalhans Keukenmeester wrote:
> I am stomped with the following problem:
>
> I have a script start.php and a second script proceed.php
>
> Relevant (and working) sections of the code:
>
> start.php
>
> <?PHP
> start_session();
> // this string will later be used to check if
> // proceed.php was invoked via the form below
> $verif_str="abcdefg";
> $name_str="hijklmn";
> // Store these vars in the SESSION array.
> $_SESSION['vstr']=$verif_str;
> $_SESSION['nstr']=$name_str;
> // output the form (in real case with correct html surrounding
> // the form, doctype, header, body tags, all that)
> echo"
> <form action='proceed.php' method='POST'>
> <input type='text' name='field_01' />
> <input type='text' name='field_02' />
> <input type='hidden' name='check' value='$verif_str' />
> <input type='submit' />
> </form>";
>>
>
> proceed.php
>
> <?PHP
> start_session();
> // read back session vars
> $verif_str=$_SESSION['vstr'];
> $name_str=$_SESSION['nstr'];
> // read back hidden form var and regular fields
> $check_str=$_POST['check'];
> $field01=$_POST['field01'];
> $field02=$_POST['field02'];
> // are these strings equal ? If not, stop processing.
> if ($verif_str != $check_str)
> exit ('Verification code incorrect');
> // Strings match, so open logfile, exit if this fails.
> $fp = @fopen('transaction.log','a');
> if ($fp===false)
> exit ('Could not open file. Aborting.');
> // write contents, for brevity additional error-checking is
> // omitted here. This exists in the actual code.
> fwrite($fp,"==============\n");
> fwrite($fp,"Verification string:".$verif_str."\n");
> fwrite($fp,"Name string:".$name_str."\n");
> fwrite($fp,$field01."\n");
> fwrite($fp,$field02."\n");
> fclose($fp);
> // rest of code, irrelevant to my issue
>>
>
> The problem:
>
> When I call the script start.php and submit the form data, 100 out of
> 100 'experiments' lead to a correct log entry being written. Both
> strings $verif_str and $name_str contain the values assigned in
> start.php.
>
> (For the record, I tried Konqueror, elinks and Firefox 1.5.0.5 for a
> browser, on a Gentoo Linux machine. The acting server is a
> Centos/Apache2.0.50/PHP4.3.4 combination)
>
> However, if some/many of the OTHER users visiting the page fill out
> the form, quite often, but not always, the session variables lose
> their values in proceed.php. The form variables are properly
> transmitted though.
>
> I have not been able to reproduce or explain this difference in
> behaviour. yet I do believe I am making some mistake somewhere in my
> code. I just fail to see it I guess.
>
> (Please ignore the stupidity of what the code actually does and
> whether that is good practice, the real case is somewhat more
> complicated and makes more sense.)
>
> Does anyone recognize this, see what's wrong and care to help me out?
> Thanks a bunch in advance!!
I don't really see anything wrong with your code. Have you been able to
check with ths users experiencing problems:
- What value the $_SESSION variable was?
- Wether they've disabled cookies?
- What happens if you just test wether a session works for them at all atm?
Grtz,
--
Rik Wasmus
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