_SESSION visibility to .PHP file

[Kurrel]

Hey Freaks,

 

I have created a .php file that creates a line graph.  With variables declared inside that file, it draws the graph but I now need to pass data to it.

 

After an earlier post $_SESSION seemed the way to go, but it doesn't appear to be visible inside that .php file.

 

I use the file thus :

print("<pre style='font-family:verdana;font-size:13'>");
	print_r($_SESSION);
	print("</pre>");
	print("<img src='".BASE."/basefunctions/maxgraphs/linegraphdrawer.php' alt='test'>");

 

and inside the function

foreach ($_SESSION as $sesskey=>$sessval) {
	imagettftext($im, $linefontsize, 0, 200, 50, $black, $font, "TEST ".$sessval);
}

 

which breaks the file because, as far as I can tell, $_SESSION is empty.  :-\

 

As far as I was aware, $_SESSION is variable to all functions called throughout the process... or is the <img> reference bypassing that?

 

If so, how do I make the variable available inside the file?

 

Kurrel.

[pranav_kavi]

ve u added session_start() at d start of the php file....?

i think that is mandatory whenever ur modifyin or adding or accessin  the session array.

[Kurrel]

I have the session_start() in the original file, index.php.

 

Just in case, I've just added it to the linegraphdrawer.php.  It declared a new session, rather than plugging the existing one.

[pranav_kavi]

ru including linegraphdrawer.php in index.php?

in tat case..u need to mention session_start() only at d start of index.php.

[Kurrel]

If I include linegraphdrawer.php in index.php the drawer bombs as the headers are redeclared.  The only way I was able to get GD to work was this fashion, and now it seems that it's functionality is compromised by an inability to pass data...

 

Seems a database reference may just be the only way to go, unless there's yet another way to reference the session?

[pranav_kavi]

Once the session variable is set,it can be accessed in any page of the application.pls post the code wher u set the session.

[Kurrel]

<?PHP


// Preperation {
                session_start();
                ob_start();

First thing in index.php,

 

$_SESSION["data"] = "TEST";
	print("<pre style='font-family:verdana;font-size:13'>");
	print_r($_SESSION);
	print("</pre>");
	print("<img src='".BASE."/basefunctions/maxgraphs/linegraphdrawer.php?test=12' alt='test'>");

 

Is then run, and the pre details the session fully, but the image that is presented on the next line does not have session referenced inside it.

[pranav_kavi]

let me get tis clear...

print_r($_SESSION);

the above line prints the session value ?

 

and the session value cannot be accessed in linegraphdrawer.php ?

[Kurrel]

Absolutely.

 

the

print("<pre style='font-family:verdana;font-size:13'>");
print_r($_SESSION);
print("</pre>");

displays every value contained in the session, but they are not available inside linegraphdrawer.php.  Hence, my confusion.

[pranav_kavi]

will this work...

print("<img src='".BASE."/basefunctions/maxgraphs/linegraphdrawer.php?test=12' alt='test'>");

 

wat does linegraphdrawer.php return?Have u tried executing d code widout using session variables in linegraphdrawer.php?

mean just 2 check if an image is actually being returned frm linegraphdrawer.php and displayed on index.php.

[Kurrel]

It all works at the moment, I have hard coded values inside linegraphdrawer.php that I am using to render the image.  It works, and displays the graph using the hard data, but I need to replace that hard data with a variable data set stored in the session.

 

the ?test=12 inside the <img> tag was to check whether _GET worked... it does, the _GET is visible when passed this way.  Still no session, though.

 

With or without the session, the .php renders the image... unless I include linegraphdrawer.php in index.php.  I can then see the session, but am unable to utilize gd to draw the graph, the purpose for which it was created in the first place.

 

Blowing my mind.

[pranav_kavi]

I assume the image is being displayed way bfore the session is set..though dont know how.

One solution is to pass the session array as a request parameter to the url at src.

[Kurrel]

Nope, the session is the first thing set in the whole process.

 

The image is drawn when the <img> flag is referenced, without prior work.  The session exists before and after, but I begin to think that since it's referencing linegraphdrawer.php directly it is using it as an external resource, in which the current variables of index.php are not visible.

[Kurrel]

 

I have tried to circumvent the problem by putting the variables into a database, only to find that any sql work apparently also breaks gd.

 

What use is a graphic set if it can't be used for anything but 100% static, isolated instances?  Is there ANY way (besides _GETting through the URL) to get variables into this?!

[pranav_kavi]

One solution is to pass the session array as a request parameter to the url at src.

 

did u try tis?I undrstand its not a preferred solution...

[Kurrel]

If by this you mean

print("<img src='".BASE."/basefunctions/maxgraphs/linegraphdrawer.php?a=".$_SESSION["blah"]."' alt='test'>");

 

I can only extend it so far... if I'm drawing a graph comparing 6 data sets across a year thats 72 variables before I've even passed the actual graph details.  The string length passable in the URL becomes a problem.