Re: session variables and scope?

On Tue, 03 Oct 2000, Scott Brown wrote: > Preface: I'm new to PHP... I've only been coding in it for a week or two - > my "day job" has me work in ASP ... > > I'm having a real weird problem here... Each of my pages (by virtue of a > standardized header) starts with a session initialization of: > > <? > session_start(); > if (!session_is_registered('dollarmode')) { > session_register('dollarmode'); > $dollarmode="US"; > } > ?> > > And inside my page, I require(..) various standardized routines, such as the > site menu, and a set of common MySQL database routines... one of which gets > me the current exchange rate for the US <-> Canadian dollar. (or as current > as I decide it needs to be by manual updates of the database ;-) > > inside the menu routine, I have this: > > <a class=menu hreg="/togglemode.php"><? > echo "<!-- " . $dollarmode . " -->"; > if ($dollarmode=="CAN") { > echo "Show US$ Prices"; > else > echo "Show CDN$ Prices"; > ?></a> > > And all works well - the toggle mode routine successfully toggles the value > of $dollarmode between "US" and "CAN" without error. Viewing the resulting > HTML sourse always shows me a valid value of $dollarmode > > One of my other routines, inside my sub.php include file, is called > GetMultiplier, which uses $dollarmode to determine if it needs to get the > exchangerate, or just default it to 1, I cant seem to reference $dollarmode > at all. > > Inside this function, a > > echo "<!-- " . $dollarmode . " -->" > > produces nothing for dollar mode - the resulting line is > > <!-- --> > > (ie, just the TWO spaces between the comment start and end tags...) If I > copy the if statement above into the GetMultiplier routine, I always see it > showing "Show CDN$ Prices"..... It's like $dollarmode doesnt exist inside > the function at all..... > > And references to $dollarmode AFTER the call to GetMultiplier do show a > valid value of $dollarmode... so I know it's not being reset somewhere. > > Is there a scope problem I've overlooked somewhere along the line? This is > driving me absolutely bonkers, as ASP session variables are available > everywhere... > > Thanks > Scott. In detail, the answer is at http://www.php.net/manual/language.variables.scope.php In short, you need to declare $dollarmode gloabal in your function, otherwise it'll be seen as a local variable in the function. Make the first line of your function global $dollarmode -- David Robley | WEBMASTER & Mail List Admin RESEARCH CENTRE FOR INJURY STUDIES | http://www.nisu.flinders.edu.au/ AusEinet | http://auseinet.flinders.edu.au/ Flinders University, ADELAIDE, SOUTH AUSTRALIA