[RESOLVED] SESSIONS - Methodology for assignments?

Rivet

PHP 5.3, Win 7, XAMPP 1.7.3 (Apache local server)

I need a further education on using sessions and variable assignments.

I have successfully used, for example, " $SESSION["d"] = $d;" to assign one variable and I can retrieve it easily enough on other pages with
"if ($code != $SESSION["d"]) { ... and it works well, regardless of what page it is, as long as I remember the session_start on such pages.

However, and this is where I get confused:

I cannot Echo "$_SESSION["d"]) and have it not throw an error such as "Notice: Undefined variable: email in ... "
Now, if I try to add another sessions variable such as
"if ($email=$_SESSION["e"]){
echo "$email . "<br />"; }
nothing happens; no error, nothing echoed, etc., to show me that it worked. e.g.

if ($email=$_SESSION["e"]){
echo "$email . "<br />"; }
else {
echo "There was no echo.";
}

Same thing: nothing echose, no errors, nothing.

Basically, why can't I echo a session variable? I know it's cockpit error, but ... what is it I don't understand?

I already have a thread open in Newbies and plan to add this there, too; but for general information, I've found this group is better because of explaining things more generally.

TIA,

Rivet`:eek:

bradgrafelman

First problem I see is that your if() statements are actually assigning values rather than comparing them; '=' is the assignment operator, not a comparison operator. For the latter, see [man]operators.comparison[/man].

Second, you should always check to see if external variables exists before you try to reference them (such as echo'ing them or comparing them in an if() condition). To do this, a few ways are: [man]isset/man, [man]empty/man, and [man]array_key_exists/man (since "external variables" implies we're talking about an index in the appropriate superglobal array, e.g. $_SESSION).

Weedpacket

When posting in the forum, please use the forum markup tags described in the FAQs to mark up your forum posts to make them easier to read.

Rivet

Understood. I think my problem is in getting the session variable to set without errors or notices. I feel, but am apparently mistaken, that I am setting up the variables properly using a similar code and copying it as precisely as I can but it's not working for me. I guess the prudent thing for me to do is repost with two sets of data: The problem areas and the complete code. I'll look more into your suggestions and see if that helps. If still no joy I'll cme back with better, more inclusive code; it's short as I'm doing one thing at a time to try to learn the best I can.

Regards,

Rivet`

Rivet

Weedpacket;11029125 wrote:
When posting in the forum, please use the forum markup tags described in the FAQs to mark up your forum posts to make them easier to read.

I hear you and I DO know better, unfortunately. I was trying to keep things short but went too far.

Apologies to all; this forum is currently my most appreciated one and I've no wish to irritate anyone.

Best Regards,

Rivet`

Weedpacket

Rivet wrote:
I guess the prudent thing for me to do is repost with two sets of data: The problem areas and the complete code.

Rather than post the complete code, try to post enough code to exhibit the problem. Trim the problem code down as far as possible by removing irrelevant bits that it still has the same problem, but not so far that it breaks for some other reason.

Not only does it help others who would otherwise have to wade through what can be hundreds or even thousands of lines of junk, it also highlights (for you as well as everyone else) just what is going on.

Other tips are in [thread=10240608]Debugging 101[/thread].

As for what bradgrafelman said: if $_SESSION['e'] (and hence $email) contains anything that PHP would consider "false", the if() test would fail.

It's also considered in some quarters to be poor style to be doing assignments in if() statements because even if it is what was intended, it doesn't look like it is what was intended. I avoid it simply because I'm tired of syntax checking IDEs whinging about it.