RE: [PHP] Too Advanced? Re: Cookies & Hidden Image

[Chris Shiflett]

--- Mark Charette <[EMAIL PROTECTED]> wrote:
> It's not a "PHP" thing, it's an HTML protocol thing ...

I think you mean HTTP. :-) HTML is a markup language.

Chris

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Re: [PHP] Too Advanced? Re: Cookies & Hidden Image

[Chris Shiflett]

--- Nicole <[EMAIL PROTECTED]> wrote:
> The problem is accessing the cookie when the script is called via
> the image tag. If the script is called directly, the cookie is
> accessible.
> 
> http://trackerurl/blahblah/script.php --- called directly can see
> the Cookie
> 
> http://trackerurl/blahblah/script.php height=1 width=1>
> --- does not see the Cookie

Is this with Internet Explorer by chance? If so, see if your results differ
when using a different browser. If you can call the resource
(http://trackerurl/blahblah/script.php) directly and get different results than
when the resource is referenced as an img tag, then something is definitely
abnormal.

You might be running into a P3P problem, which I can explain further if my
suspicions are correct. Something that would *really* help us is the HTTP
request and HTTP response from these two transactions:

1. http://trackerurl/blahblah/script.php is accessed directly by the browser.
2. The browser accesses a page that references
http://trackerurl/blahblah/script.php in an img tag.

If you are running Windows (my assumption, no offense intended), you can use
ethereal to get this information.

Chris

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RE: [PHP] Too Advanced? Re: Cookies & Hidden Image

[Mark Charette]

> From: Nicole [mailto:[EMAIL PROTECTED]
>
> Thanks. The cookie sets fine using the redirect. The problem is accessing
> the cookie when the script is called via the image tag. If the script is
> called directly, the cookie is accessible.

Images have their own connection (which is why you can see a page before an
image is downloaded, and why pages resize if width & height are not set on
the image). Cookie values via images are not "passed to parent", though
judicious use of javascript _may_ be able to retrieve the value - I've not
seen it done, but it _might_ be possible, though I doubt it.

It's not a "PHP" thing, it's an HTML protocol thing ...

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Re: [PHP] Too Advanced? Re: Cookies & Hidden Image

[John W. Holmes]

Nicole wrote:

Not sure what else to do other than try something different. Using Cookie
seems to be the only way to store the value on the client side for later
retrieval.
How about using a session and passing the session ID in the URL for the 
cookie?

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Re: [PHP] Too Advanced? Re: Cookies & Hidden Image

[Nicole]

Thanks. The cookie sets fine using the redirect. The problem is accessing
the cookie when the script is called via the image tag. If the script is
called directly, the cookie is accessible.

http://trackerurl/blahblah/script.php--- called directly can see the
Cookie

http://trackerurl/blahblah/script.php height=1 width=1>--- does
not see the Cookie

Not sure what else to do other than try something different. Using Cookie
seems to be the only way to store the value on the client side for later
retrieval.

Thanks,

Nicole

"Diego Fulgueira" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> Nothing is too advanced for this newgroup and there is not other better. I
> did not read your problem very carefully, but I think you are trying to
set
> a cookie on a page that does a redirect, that is just impossible unless
you
> do the redirect with a meta tag on the client.
>
> Anyway, if that suggestion doesn't do it for you, I once used the
following
> function to set cookies and it worked for me:
>
> function MySetCookie
> ($CkyName, $CkyVal, $exp, $pth, $Domain)
> {
>  $exp = strftime("%A, %d-%b-%Y %H:%M:%S", $exp);
>  $cookiestr = sprintf ("%s=%s; domain=%s; path=%s; expires=%s",
>  $CkyName, $CkyVal, $Domain, $pth, $exp);
>  $mycky = (isset($mycky) ? "$mycky\n" : "")."Set-Cookie: $cookiestr";
>  header($mycky);
> }
>
>
> Cheers,
> Diego
>
> - Original Message -----
> From: "Nicole" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Wednesday, September 03, 2003 3:57 PM
> Subject: [PHP] Too Advanced? Re: Cookies & Hidden Image
>
>
> > Is this question too advanced for this newsgroup? Is there a better
> > newsgroup to post this one too?
> >
> > Thanks,
> >
> > --
> > Nicole
> >
> >
> > "Nicole" <[EMAIL PROTECTED]> wrote in message
> > news:[EMAIL PROTECTED]
> > > Hi,
> > >
> > > I am working on a script that uses cookie to store some info on the
> client
> > > side.  The user will click a link that contains info about where the
> link
> > > was placed. The script will then store that info so that when the user
> > > returns later and makes a purchase, I can see where they came from.
> > >
> > > The problem I am having is this:
> > >
> > > The link is a redirect url that first goes to one domain where the
> cookie
> > is
> > > created by. Then they are taken to the site where products are sold.
> > >
> > > Then, after they make a purchase, they are taken to a thank you page
> that
> > > has a hidden tracker to track that sale.
> > >
> > > http://trackerurl.com/?var=1&var=2&blahbla height=0 width=>
> > >
> > > The image loads the script from a different domain (where the cookie
was
> > > initialy created by).  The problem now is that the script gets a blank
> > > cookie when using the hidden image to load the script.
> > >
> > > So does anyone know why this is happening?
> > >
> > > I have   setCookie('CookieName', $value, $expires);
> > >
> > > Then I try to retrieve that cookie again later with
> > $_COOKIE['CookieName']
> > > ... but the value stored is not there when the script is called from
the
> > > hidden image.  HOWEVER, the value is there when the script is called
> > > directly.
> > >
> > > Any ideas?
> > >
> > > Thanks!!
> > >
> > > Nicole
> >
> > --
> > PHP General Mailing List (http://www.php.net/)
> > To unsubscribe, visit: http://www.php.net/unsub.php
> >
>

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Re: [PHP] Too Advanced? Re: Cookies & Hidden Image

[Marek Kilimajer]

I don't accept third party cookies. Maybe your browser is set up so it 
does not too. Check the privacy & security settings.

Nicole wrote:
The cookie is being accessed by the same domain it was generated by. The
problem is, the script is being pulled up via a hidden image (which resides
on a different domain). So that may still be the problem anyway.
Thanks.

--

"Ernest E Vogelsinger" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
At 23:55 03.09.2003, Nicole said:
[snip]
But the script just gets a blank cookie when accessed this way(via hidden
image); However, if the script was accessed directly, or the thankyou
page

resided on the same domain as the tracking script (which created the
cookie

to begin with), the cookie has the value that it was set with.
[snip]

That's it - cookies will only be sent to the same domain (hostname) they
have been generated at. You cannot pass cookies between domains
(hostnames).

--
  >O Ernest E. Vogelsinger
  (\)ICQ #13394035
   ^ http://www.vogelsinger.at/


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Re: [PHP] Too Advanced? Re: Cookies & Hidden Image

[Viraj Kalinga Abayarathna]

Hi Nicole,
You can not retrieve information stored in a cookie which set by 
one domain from some other domain. Try passing all the information 
you want with the image SRC tag.

regards
Viraj


Nicole wrote:
> 
> OK. Thanks.
> 
> I have the hidden image code:
> 
> http://thetrackingurl/?param1=val1¶m2=val2&etc... height=0
> width=0 border=0>
> 
> This hidden image code is placed on the ThankYou page that people see after
> they have bought something.  What it does is load a script on the tracking
> site to let the owner know a sale was made.
> 
> The tracking site is different from the site that the product is sold on.
> 
> A cookie was placed on the client's (buyer) side to store where that client
> originated from. So when the hidden image is called, the tracking script is
> called and tries to access this cookie to retrieve where the buyer came
> from.
> 
> But the script just gets a blank cookie when accessed this way(via hidden
> image); However, if the script was accessed directly, or the thankyou page
> resided on the same domain as the tracking script (which created the cookie
> to begin with), the cookie has the value that it was set with.
> 
> Does this make sense?  Thanks for any input.  PHP's docs on sessions didn't
> seem to have anything relating to this situation; so I'm stuck.
> 
> Nicole
> 
> "Chris Shiflett" <[EMAIL PROTECTED]> wrote in message
> news:[EMAIL PROTECTED]
> > --- Nicole <[EMAIL PROTECTED]> wrote:
> > > Is this question too advanced for this newsgroup?
> >
> > Somehow I doubt it. But, that's a nice tactic for grabbing some attention.
> :-)
> >
> > Show us some sample code of a very small test case. I can't really follow
> your
> > description of what you are trying to do.
> >
> > Chris
> >
> > =
> > Become a better Web developer with the HTTP Developer's Handbook
> > http://httphandbook.org/
> 
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Re: [PHP] Too Advanced? Re: Cookies & Hidden Image

[Diego Fulgueira]

Nothing is too advanced for this newgroup and there is not other better. I
did not read your problem very carefully, but I think you are trying to set
a cookie on a page that does a redirect, that is just impossible unless you
do the redirect with a meta tag on the client.

Anyway, if that suggestion doesn't do it for you, I once used the following
function to set cookies and it worked for me:

function MySetCookie
($CkyName, $CkyVal, $exp, $pth, $Domain)
{
 $exp = strftime("%A, %d-%b-%Y %H:%M:%S", $exp);
 $cookiestr = sprintf ("%s=%s; domain=%s; path=%s; expires=%s",
 $CkyName, $CkyVal, $Domain, $pth, $exp);
 $mycky = (isset($mycky) ? "$mycky\n" : "")."Set-Cookie: $cookiestr";
 header($mycky);
}


Cheers,
Diego

- Original Message -
From: "Nicole" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, September 03, 2003 3:57 PM
Subject: [PHP] Too Advanced? Re: Cookies & Hidden Image


> Is this question too advanced for this newsgroup? Is there a better
> newsgroup to post this one too?
>
> Thanks,
>
> --
> Nicole
>
>
> "Nicole" <[EMAIL PROTECTED]> wrote in message
> news:[EMAIL PROTECTED]
> > Hi,
> >
> > I am working on a script that uses cookie to store some info on the
client
> > side.  The user will click a link that contains info about where the
link
> > was placed. The script will then store that info so that when the user
> > returns later and makes a purchase, I can see where they came from.
> >
> > The problem I am having is this:
> >
> > The link is a redirect url that first goes to one domain where the
cookie
> is
> > created by. Then they are taken to the site where products are sold.
> >
> > Then, after they make a purchase, they are taken to a thank you page
that
> > has a hidden tracker to track that sale.
> >
> > http://trackerurl.com/?var=1&var=2&blahbla height=0 width=>
> >
> > The image loads the script from a different domain (where the cookie was
> > initialy created by).  The problem now is that the script gets a blank
> > cookie when using the hidden image to load the script.
> >
> > So does anyone know why this is happening?
> >
> > I have   setCookie('CookieName', $value, $expires);
> >
> > Then I try to retrieve that cookie again later with
> $_COOKIE['CookieName']
> > ... but the value stored is not there when the script is called from the
> > hidden image.  HOWEVER, the value is there when the script is called
> > directly.
> >
> > Any ideas?
> >
> > Thanks!!
> >
> > Nicole
>
> --
> PHP General Mailing List (http://www.php.net/)
> To unsubscribe, visit: http://www.php.net/unsub.php
>

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Re: [PHP] Too Advanced? Re: Cookies & Hidden Image

[John W. Holmes]

Nicole wrote:
I have the hidden image code:

http://thetrackingurl/?param1=val1¶m2=val2&etc... height=0
width=0 border=0>
This hidden image code is placed on the ThankYou page that people see after
they have bought something.  What it does is load a script on the tracking
site to let the owner know a sale was made.
The tracking site is different from the site that the product is sold on.

A cookie was placed on the client's (buyer) side to store where that client
originated from. So when the hidden image is called, the tracking script is
called and tries to access this cookie to retrieve where the buyer came
from.
But the script just gets a blank cookie when accessed this way(via hidden
image); However, if the script was accessed directly, or the thankyou page
resided on the same domain as the tracking script (which created the cookie
to begin with), the cookie has the value that it was set with.
Do you set the cookie on "thetrackingurl"?

--
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Amazon Wishlist: www.amazon.com/o/registry/3BEXC84AB3A5E/

php|architect: The Magazine for PHP Professionals – www.phparch.com

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Re: [PHP] Too Advanced? Re: Cookies & Hidden Image

[Chris Shiflett]

--- Nicole <[EMAIL PROTECTED]> wrote:
> http://thetrackingurl/?param1=val1¶m2=val2&etc...

[snip]

> The tracking site is different from the site that the product is sold on.
> 
> A cookie was placed on the client's (buyer) side to store where that
> client originated from. So when the hidden image is called, the
> tracking script is called and tries to access this cookie to retrieve
> where the buyer came from.

I think I understand now. I think you are understanding everything except how a
request is made for an embedded resource such as an image. These requests are
identical to the requests for the parent resource.

First, let us make up some domains, so that this is clear:

1. store.org - where the user is making the purchase
2. track.org - where the image is located

The cookie is being set as the user is browsing store.org, correct? As such, it
will only be sent in future requests for resource within store.org's domain.
When the browser requests the image from track.org, the domain is different, so
the cookie is not sent.

This is no different than why cookies for php.net aren't sent to amazon.com.

Hope that helps.

Chris

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Re: [PHP] Too Advanced? Re: Cookies & Hidden Image

[Nicole]

The cookie is being accessed by the same domain it was generated by. The
problem is, the script is being pulled up via a hidden image (which resides
on a different domain). So that may still be the problem anyway.

Thanks.

--

"Ernest E Vogelsinger" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> At 23:55 03.09.2003, Nicole said:
> [snip]
> >But the script just gets a blank cookie when accessed this way(via hidden
> >image); However, if the script was accessed directly, or the thankyou
page
> >resided on the same domain as the tracking script (which created the
cookie
> >to begin with), the cookie has the value that it was set with.
> [snip]
>
> That's it - cookies will only be sent to the same domain (hostname) they
> have been generated at. You cannot pass cookies between domains
(hostnames).
>
>
> --
>>O Ernest E. Vogelsinger
>(\)ICQ #13394035
> ^ http://www.vogelsinger.at/

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Re: [PHP] Too Advanced? Re: Cookies & Hidden Image

[Ernest E Vogelsinger]

At 23:55 03.09.2003, Nicole said:
[snip]
>But the script just gets a blank cookie when accessed this way(via hidden
>image); However, if the script was accessed directly, or the thankyou page
>resided on the same domain as the tracking script (which created the cookie
>to begin with), the cookie has the value that it was set with.
[snip] 

That's it - cookies will only be sent to the same domain (hostname) they
have been generated at. You cannot pass cookies between domains (hostnames).


-- 
   >O Ernest E. Vogelsinger
   (\)ICQ #13394035
^ http://www.vogelsinger.at/

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RE: [PHP] Too Advanced? Re: Cookies & Hidden Image

[Chris W. Parker]

Nicole 
on Wednesday, September 03, 2003 2:56 PM said:

> But the script just gets a blank cookie when accessed this way(via
> hidden image); However, if the script was accessed directly, or the
> thankyou page resided on the same domain as the tracking script
> (which created the cookie to begin with), the cookie has the value
> that it was set with. 

If I understand you correctly, you are either leaving out important
details that would prevent my "solution" from working, or you're just
making it difficult for yourself because you're a masochist. ;)

Why don't you just send all the data you need to send via the url in the
 tag instead of relying on the cookie?


Chris.

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Re: [PHP] Too Advanced? Re: Cookies & Hidden Image

[Nicole]

OK. Thanks.

I have the hidden image code:

http://thetrackingurl/?param1=val1¶m2=val2&etc... height=0
width=0 border=0>

This hidden image code is placed on the ThankYou page that people see after
they have bought something.  What it does is load a script on the tracking
site to let the owner know a sale was made.

The tracking site is different from the site that the product is sold on.

A cookie was placed on the client's (buyer) side to store where that client
originated from. So when the hidden image is called, the tracking script is
called and tries to access this cookie to retrieve where the buyer came
from.

But the script just gets a blank cookie when accessed this way(via hidden
image); However, if the script was accessed directly, or the thankyou page
resided on the same domain as the tracking script (which created the cookie
to begin with), the cookie has the value that it was set with.

Does this make sense?  Thanks for any input.  PHP's docs on sessions didn't
seem to have anything relating to this situation; so I'm stuck.

Nicole


"Chris Shiflett" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> --- Nicole <[EMAIL PROTECTED]> wrote:
> > Is this question too advanced for this newsgroup?
>
> Somehow I doubt it. But, that's a nice tactic for grabbing some attention.
:-)
>
> Show us some sample code of a very small test case. I can't really follow
your
> description of what you are trying to do.
>
> Chris
>
> =
> Become a better Web developer with the HTTP Developer's Handbook
> http://httphandbook.org/

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Re: [PHP] Too Advanced? Re: Cookies & Hidden Image

[Chris Shiflett]

--- Nicole <[EMAIL PROTECTED]> wrote:
> Is this question too advanced for this newsgroup?

Somehow I doubt it. But, that's a nice tactic for grabbing some attention. :-)

Show us some sample code of a very small test case. I can't really follow your
description of what you are trying to do.

Chris

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[PHP] Too Advanced? Re: Cookies & Hidden Image

[Nicole]

Is this question too advanced for this newsgroup? Is there a better
newsgroup to post this one too?

Thanks,

--
Nicole


"Nicole" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> Hi,
>
> I am working on a script that uses cookie to store some info on the client
> side.  The user will click a link that contains info about where the link
> was placed. The script will then store that info so that when the user
> returns later and makes a purchase, I can see where they came from.
>
> The problem I am having is this:
>
> The link is a redirect url that first goes to one domain where the cookie
is
> created by. Then they are taken to the site where products are sold.
>
> Then, after they make a purchase, they are taken to a thank you page that
> has a hidden tracker to track that sale.
>
> http://trackerurl.com/?var=1&var=2&blahbla height=0 width=>
>
> The image loads the script from a different domain (where the cookie was
> initialy created by).  The problem now is that the script gets a blank
> cookie when using the hidden image to load the script.
>
> So does anyone know why this is happening?
>
> I have   setCookie('CookieName', $value, $expires);
>
> Then I try to retrieve that cookie again later with
$_COOKIE['CookieName']
> ... but the value stored is not there when the script is called from the
> hidden image.  HOWEVER, the value is there when the script is called
> directly.
>
> Any ideas?
>
> Thanks!!
>
> Nicole

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