PHP sessions with img tag

shatner

I am trying to get a script that is called using an IMG tag to set a session variable. If i run the script directly i.e. type in the address to the script it works fine but when i call it from another site using an IMG tag it wont work.

As PHP is server-side i assumed the script would write the variable to the server it is running from and so it wouldnt matter where it was called from?!

This is the bit of code im using to set the variable but as i mentiond it is working, just not from the other site.

if(!$counted) {
$hitunique = "1"; // unique
$counted = "yes";
session_register('counted');
}
else{
$hitunique = "0"; // not unique
}

Is this something that is possible?

Any help or ideas would be great.

Shat

Shrike

I take it the img tag on the other site has a fully qualified domain name, e.g <img src="http://www.thephpsite.com/file.php" ... />?

shatner

The rest of the script works fine so the tag is correct. Its just the session variable.

Shrike

Linking from another website is no different to linking from the same website - both use the same HTTP request.

Check that any required parameters are getting passed correctly, perhaps?

Off topic, but session_register() is a deprecated function, you can write to the session array in the same way you read from it.

shatner

I'm still having problems with this, I have striped out everything from the script to see if I can just get this bit working but I'm still having no luck. It just seems strange to me that if I type the url in and then refresh the page everything seems to work ok!?

Here is the code I’m using:

<?php
session_start();

// see if this is a unique hit or not
if(!$counted) {
$hitunique = "1";
$_SESSION["counted"] = "yes";
}
else{
$hitunique = "0"; // not unique
}

// connect to the database
include('connectdb.php');

// save main data to table
$sql = "INSERT INTO fstat_autocount (id, time, referer, page, browser, os, language, hitunique, member, domain) VALUES ('','-','-','-','-','-','-','$hitunique','-','-')";

$result = mysql_query($sql);
exit;
?>

And this is what im calling it with:

One thing I did notice is that i was getting server variables like http_user_agent and they were shown as the variables from the page that calls the script. Does this mean my script is trying to set variables on the originating site and not the site the script runs from? I know its server-side and so shouldn’t matter, but I’m getting confused as to why its not working.

Any ideas?

Shatner