[pmwiki-users] $PreviousPage variable?

[Martin Fick]

--- Sivakatirswami <katir at hindu.org> wrote:
> Martin Fick wrote:
> 
> > Yes, but you can always just make a patch file,
> > hopefully it will continue to apply cleanly.
> 
> how do you make a "patch file" (I'm PHP ignorant)
> that would insert a single line
> 
> $qf .= $qf ? "&amp;":"?" . "PreviousPage=$pagename";
> 
> in that exact location? :

A patch is actually not PHP specific, but rather a
general unix mechanim that uses the diff and patch
commands.  Typically you would take the original file
and diff it to the modified one (perhaps with the -c
context option) and save the output creating a patch
file.  This diff (patch file) can then be appliead to
a future version of the original file using the path
command.  If not too many things have changed between
the versions it will be able to locate where that "one
line" should be inserted and insert it for you.


> > config.php to access the GET variable, something
> > like this:
> > 
> >   $FmtPV['$PreviousPage'] =
> '$_GET["PreviousPage"]';
> 
> hmmm. I have no problem installing the complete
> recipe,
> but, for clarity's sake: are you saying that 
> '$_GET["PreviousPage"]'
> is available to the PMwiki  as a global  environment
> variable
> even without httpVariables.php loaded? i.e. what do
> you
>  mean by "don't... install the completeHttpVariables
> recipe?"

PHP puts all GET variables (variable appended to URLs)
inside the $_GET array.  The $FmtPV['$PreviousPage']
assignment is a PmWiki mechanism to make it available
as a page variable.

The HttpVariables recipe makes ALL GET (and POST and
COOKIES and SESSION) variables available as special
pagevariables using a slightly different markup. 
Either option (manual pagevarible definition or
HttpVariables recipe) will get you what you want.



> > See the section on custom pagevariables here:
> > http://www.pmwiki.org/wiki/PmWiki/PageVariables
> > If you do this, it will be accessed without the
> "?": {$PreviousPage}
> 
> I looked thru those doc pages before, and I think
> it's clear but saw no mention of access to Apache
> http environment variables  -- which I understand
> to be the array below that I get from a revolution >
echo globals cgi. which are normally accessible to >
any cgi language and I'm assuming PHP as well.
> "HTTP_REFERRER" is not on this list but would be in
> other contexts

In PHP these are $_SERVER[] I think.
 
Hope this clears things up a bit,

-Martin



       
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