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problems with setting sessions via post, keeps overwriting and clearing

Posted on 2008-06-19
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Last Modified: 2010-04-21
Hi

(not really sure if my ideas are safe or the best way so expert guidance would be very well received)
 
I'm trying to set session values using a post to a controller page that basically receives all the post commands then send the page on (bit like struts in Java)

foreach ($_POST as $var => $val) {
      $_SESSION[$var] = $val;
}


My forms pages contain form input elements such as:
  <input type="hidden" name="details[thisFund]" value="ctx" />
  <input type="hidden" name="details[thisAction]" value="_details" />

Which would create sessions such as:
$_SESSION['details']['thisFund']
$_SESSION['details']['thisAction']

All seems to work ok, but if the post gets another value such as
 <input type="hidden" name="details[name]" value="neil" />
this would erase all my current details[xxx][xxx] sessions.

Can someone advise me how to perhaps
1) check if the session exists first
2) if that particular one such as name[xx][xx] does already exist over write just that one
3) if the base exists e.g. name as a session just append it

Hope that makes sense, basically add if not there, amend if it is

Asking for your wisdom mighty ones!

Neil
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Question by:Neil Thompson
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4 Comments
 
LVL 48

Expert Comment

by:hernst42
ID: 21821042
You can use this function to merge the arrays without overwriding.

See http://www.php.net/session for more about sessions
function merge(&$dst, $src) {
    if (!is_array($src)) {
        $dst = $src;
        return;
    }
    foreach($src as $k => $v) {
        merge($dst[$k], $v);
    }
}
 
$_SESSION = array();
$_POST1 = array('details' => array('a' => 'a', 'b' => 'b'));
$_POST2 = array('details' => array('c' => 'c'));
 
merge($_SESSION, $_POST1);
merge($_SESSION, $_POST2);
 
var_dump($_SESSION);

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LVL 3

Author Comment

by:Neil Thompson
ID: 21826618
Hi

I've tried your example using:

function merge(&$dst, $src) {
    if (!is_array($src)) {
        $dst = $src;
        return;
    }
    foreach($src as $k => $v) {
        merge($dst[$k], $v);
    }
}
 
$_SESSION = array();
merge($_SESSION, $_POST);

And they didnt appear to set, am I doing it wrong?
Neil
0
 
LVL 48

Accepted Solution

by:
hernst42 earned 500 total points
ID: 21826751
don't clear $_SESSION. init $_SESSION on the first page, then make sure you have always
session_start() called before you merge the infos on the following pages.

it was in my example just for init the variable.
0
 
LVL 3

Author Closing Comment

by:Neil Thompson
ID: 31468710
Sorry, I'm bit of a cut and paster!
Many thanks
Neil
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