additional sessions explanation please

sinus_

hello,

i have been reading Beginning PHP4 for severals days now. its time that i ask some of your expert thoughts about this one. i just need to clarify thru someone else what the "...".SID."&whichpage..." below does...

there are comments in the code.. pls read them...

<?php
session_register("view1count");
session_register("view2count");
session_register("view3count");
session_register("view4count");

//page_count.php
?>

<?php
if (!$view1count) $view1count = 0;
if (!$view2count) $view2count = 0;
if (!$view3count) $view3count = 0;
if (!$view4count) $view4count = 0;

echo "<HTML><HEAD><TITLE>Web Page Hit Counter</TITLE></HEAD><BODY>";

if ($_GET['whichpage']) {
	echo "<B>You are currently on page $whichpage.</B><BR><BR>\n";
	$GLOBALS["view${whichpage}count"]++;
}

for ($i=1;$i<=4;$i++) {
	if ($whichpage == $i) {
	//What's up with SID and &whichpage???
	//what is the use of the "&" (without the quotes)
	//do we always use something like this: ".SID."&whichpage=$i" when sessions?
	//like we "connect" SID and whichpage with a "&" ???
		echo "<B><A HREF = \"$PHP_SELF?".SID."&whichpage=$i\">Page $i</A></B>";
	} else {
		echo "<A HREF = \"$PHP_SELF?".SID."&whichpage=$i\">Page $i</A>";
	}
	echo ", which you have chosen ".$GLOBALS["view${i}count"]." times.<BR>\n";
}
echo "\n\n<BR><BR>\n\n";
echo "</BODY></HTML>";

?>

that's about it...i fairly understand what are sessions and the SID...
the book im reading is quite easy to understand. but i need more info on what "...".SID."&whichpage..." is actually doing.
i appreciate your reply and thank you for satifying my curiousity...
🙂
cheers 😃

leatherback

Originally posted by sinus_ //What's up with SID and &whichpage???
//what is the use of the "&" (without the quotes)
//do we always use something like this: ".SID."&whichpage=$i" when sessions?
//like we "connect" SID and whichpage with a "&" ???

Hi, basically what you see is that the values of two variables are being passed bewteen pages through the URL of the page.

The $SID and $whichpage are two variables used in this script. $SID most likely hold the session Identification. $Whicpage is some sort of identifier for the [age to be loaded.

The "$" tells PhP that the word after it is a variable.

In a weblink the sets of variable (&whichpage) and value (=$i) are indeed always linked with and &. In this case it is a bit speciel, since it doesn't transfer the name (SID) of the session identifier, but just the value.

sinus_

ah ic. im starting to get it al lil' now 🙂
thanks leatherback...
btw, SID is predefined global variable? thats why it doesnt need a $ before it?