php sessions

[jamesloi]

Hi

I am tryin to create a shopping basket using sessions. the first page starts the session sessiontrolley.php

<?php
session_start();  // Initialise session
session_register("trolleyContents");  // Register our variables
?>
<form method="post" action="sessiontrolley2.php?<?=SID?>">
Choose an item: </p>
<input type="radio" name="choice" value="camera" /> camera<br />
<input type="radio" name="choice" value="snorkel" /> snorkel<br />
<input type="radio" name="choice" value="octopus" /> octopus<br />
<input type="radio" name="choice" value="cuddly toy" /> cuddly toy<br /><br />
<input type="submit" name="submit" value="Add to the trolley" />
</form>

and the second page displays the selected product sessiontrolley2.php

<?php

if ((!$trolleyContents && !$choice) || $clear) {
   $trolleyContents = "";
   echo "<p>Trolley currently empty</p>";
} else {
   if ( $choice ) $trolleyContents = $trolleyContents . "<li>$choice</li>";
   echo "<p>Trolley contains:</p>";
   echo "<ul>$trolleyContents</ul>";
}
echo ("<a href=\"http://stuweb.cms.gre.ac.uk/~lj917/sessiontrolley.php\"> Continue shopping<a/>");
?>

Every time i go back to the sessiontrolley.php i want to add a new product to the trolley. What happens at the moment is that the product gets replaced with te new one. does anyone know how to solve this? I have also tried to start the session in a page before sessiontrolley.php but it still doesn't store my products.😕

[kinadian]

To store multiple items into your cart, I'd suggest using an array. If you use one variable, it will only hold the last item added to the cart. (Which is one of your problems).

Also, you need to have session_start() on every page that you wish to use the session. You do not need to store the session id, since that is handled through the browser with cookies and the server with local files.

--kinadian

[jamesloi]

I am starting a session on the 2 pages but i am gettin these errors
Warning: open(/tmp\sess_8eb0baf82c0359813d95855149e958ad, O_RDWR) failed: No such file or directory (2) in c:\web\phpweb\sessiontrolley2.php on line 2

Warning: open(/tmp\sess_8eb0baf82c0359813d95855149e958ad, O_RDWR) failed: No such file or directory (2) in Unknown on line 0

Warning: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/tmp) in Unknown on line 0

any ideas dude?

[kinadian]

In your php.ini .. did you specifiy a valid location for your php sessions? On a UNIX machine, the directory must exist and the proper permissions must be in state. On a Windows machine, the directory must exist and it cannot be "readonly".

Also, the client must have cookies enabled for sessions to work.

--kinadian

[lobobr]

Sorry, but this is incorrect.

You can use sessions without cookies.

Just set the session.use_cookies value to zero in your php.ini

Regards,

[suntra]

Ok...

First, sessions are transmitted by cookie or by the PHPSESSID in the URL. If the client doesn't allow cookie, it will be sent in the URL, that's why you have to put the ID in every link, every form, every javascript location statement, etc.

Second, you may get an error if you use $variable_name instead of $SESSION["variable_name"]. In fact, you should use $SESSION["variable_name"]. But take care, if you use $SESSION, DON'T use session_register. You simply set the value by writing $SESSION["variable_name"] = "value";. Otherwise, you'll get empty variables.

Hope this helps.