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Posted by Rami Elomaa on 07/15/07 15:53
W Marsh kirjoitti:
> On 15 Jul, 14:41, Jerry Stuckle <jstuck...@attglobal.net> wrote:
>> W Marsh wrote:
>>> Hi. In my application I do something very simple - I open a file, lock
>>> it exclusively, write some data to it and close it.
>>> If I re-open it in the same process (I mean before the script has
>>> ended) to read the file, I find that the data I have written doesn't
>>> exist in there. I can't read it back until I run the script again.
>>> My question follows: WHAT
>> Sorry, my crystal ball is in the shop. I have no idea what might be
>> happening. Maybe if you post your code...
>>
>> --
>> ==================
>> Remove the "x" from my email address
>> Jerry Stuckle
>> JDS Computer Training Corp.
>> jstuck...@attglobal.net
>> ==================
>
> No. For one thing it's private, commercial code, and secondly, I've
> given enough information about the problem.
>
> I don't appreciate people making sarcastic comments like that. If you
> have no idea about the problem then keep quiet, or if you genuinely
> are missing important details, make a polite request, e.g. "Are you
> doing X between closing and re-opening the file?". I'm not an outlet
> for problems with your insecurities and ego.
>
> If you really are that unimaginative, then here's some code (using my
> own original description as a design spec, proving my point somewhat):
>
> define(FILE_NAME, "somefile.txt");
>
> $dataOrig = array("here", "is", "some", "data", "to", "be",
> "serialized");
>
> $file = fopen(FILE_NAME, "w");
> flock($file, LOCK_EX);
> fwrite($file, serialize($dataOrig));
> fclose($file);
>
> $file = fopen(FILE_NAME, "r");
> $dataNew = unserialize(fread($file, filesize(FILE_NAME)));
>
> print_r($dataNew); // Expected output: Array ( [0] => here [1] => is
> [2] => some [3] => data [4] => to [5] => be [6] => serialized )
>
> It is not representative of the original code in terms of design or
> error checking, but it does reproduce the problem on the production
> server (no output, due to getting no data in the original file). It
> does however run correctly on a my own web server, which suggests the
> problem is one of configuration that somebody with experience in this
> field could shed some light on, which I would be grateful for.
I'm not sure if you already mentioned this, but if you manuallu open the
file after running the script, are the values actually written into it,
on the server where it doesn't work? I mean have you really checked that
the problem is not in writing to it, but actually reading from it?
What does
var_dump( filesize(FILE_NAME) );
give you?
Try putting it before the line
$dataNew = unserialize(fread($file, filesize(FILE_NAME)));
If it yields zero, which might be possible for just created file it
might be getting it from cache. If this is the case, then running
clearstatcache() ought to solve the problem.
BTW, I didn't think Jerry's request for code was unreasonable. For
instance there are many ways for reading from a file. I for one couldn't
have imagined using fread($file, filesize(FILE_NAME)) for reading, cos I
always use file_get_contents. That's why I think it was good that you
provided the sample code rather than leave us scraching our heads with
nothing. When someone asks you for sample code, of course you don't need
to post the in-house production code, just something that effectively
reproduces the error.
--
Rami.Elomaa@gmail.com
"Wikipedia on vähän niinq internetin raamattu, kukaan ei pohjimmiltaan
usko siihen ja kukaan ei tiedä mikä pitää paikkansa." -- z00ze
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