global variables?

[Anon]

Hello

I'm trying to define the header of my page according to the screen res. of the user. I use a javascript to catch there screen res. and pass it to php but the variable header is only defined on the first page. this is the code:

$scr_x = $HTTP_GET_VARS["w"];
$scr_y = $HTTP_GET_VARS["h"];
if ($scr_x > 1000){
$header = "header1024.inc";}
else {
$header = "header800.inc";}
}

How could I make the var $header global so that once he is defined on the first page the value of header isn't redefined?

[Anon]

Since HTTP is stateless you'll have to pass any variables to your page everytime as the webserver/php will not remeber them.

You can do this in a couple of ways:

1. Cookies - good for small amounts of non critical data. Variable's are stored on the user's machine, so they could be altered easily. Browser passes the varaibles to PHP automaticly. User can also disable cookies.

2. Form Data or querystring - You'd have to remember to add the variables as a hidden input field in every form and also append the variables onto the end of every url (querystring). Impractical.

3. Sessions - slightly harder to setup but good for storing large amounts of sensitive data. Variables are commonly stored in a db table with a reference id stored in the querystring or as a cookie.

The manual has more detail on cookies and sessions.

[Anon]

Thx a lot for complete and fast answer!