On Wednesday 31 October 2001 18:18, René Fournier wrote:
> Here's what I've got, starting at the top...
>
> ==========================================
> <?php
> header ('Expires: Mon, 26 Jul 1997 05:00:00 GMT'); // Date in
> the past header ('Last-Modified: ' . gmdate('D, d M Y H:i:s') . '
> GMT'); // always modified header ('Cache-Control: no-cache,
> must-revalidate'); // HTTP/1.1 header ('Pragma: no-cache');
> // HTTP/1.0 ?><html>
> <head>
> <title>Title</title>
> <META HTTP-EQUIV="Expires" CONTENT="0">
> <meta http-equiv="Content-Type" content="text/html;
> charset=iso-8859-1">
>
> [SNIP]
>
> <?php
> function randbg() {
> $num_of_bgs = 5;
> $the_one = rand(1,$num_of_bgs);
> echo "bg".$the_one.".jpg";
> }
> ?>
>
> [SNIP]
>
> <td valign=top align=left background=../common/images/bg/<?php
> randbg(); ?>> ==========================================
Ah, so you have bg1.jpg, bg2.jpg and so on till 5.
And want to show one of them selected by a random value?
So when you click on browser's refresh button, what happens?
You always get the same page as before with for example bg1.jpg?
Do you seed the random number generator (srand()) before you use
rand() function?
Arpi
> Here's why I think it's PHP4: If I look at these pages on my local
> machine (WinME, Apache 1.3.20, PHP4.06 module, MySQL 3.23.14 (not
> that it matters, right?)), the randbg() function works as it
> should--I get a random background image everytime. But if I look
> at these EXACT SAME pages on Fatcow (Linux/Apache, I believe,
> PHP4...), the randbg() function executes the first time, then
> [seemingly] fails to execute again--it never generates a different,
> random bakground. (Or maybe I'm looking at one hell of a
> coincidence :-)
>
> So my question is, who is caching what, where?
>
> ...Rene
>
> > -----Original Message-----
> > From: Tamas Arpad [mailto:[EMAIL PROTECTED]]
> > Sent: Wednesday, October 31, 2001 7:24 AM
> > To: René Fournier; Hugh Danaher
> > Cc: Php-General
> > Subject: Re: [PHP] Re: Weird caching problem with PHP4/Apache
> >
> > On Wednesday 31 October 2001 14:48, René Fournier wrote:
> > > Nope, unfortunately, nothing. It's a really weird problem.
> > > It's like the PHP function I wrote for generating the random
> > > image will only work the first time.
> >
> > I think it is not php that caches it. As I undertsand you wrote a
> > script that generates an image, and give it back to the browser
> > in an <img src=...> html tag. Am I right?
> > I hope I am, so I continue :))
> > Images can be cached in many places (proxies, browser), but
> > definietly not in php. Your script that generates in the image
> > and should be called every time by the <img> html tag, won't ever
> > called again if the previous image were stored somewhere. You
> > should send "pragma no-cache" and other http headers (many posts
> > were on this "cache headers" topic) from the script that
> > generates and gives back the image.
> > Or another sollution is that you can call your script with a
> > random number or better with the current date and time, so you
> > images's name won't be the same, and caches can't give back the
> > old image. for example:
> > <?php echo"<img src=\"generatebackground.php?x=".date("YmdHis").
> > "\">";?>
> >
> > Arpi
> >
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