Re: $r->subprocess_env('REQUEST_URI') returns undef ?

[Torsten Förtsch]

On Friday 15 January 2010 19:41:45 Tosh Cooey wrote:
> When the $key argument (string) is passed, it returns the corresponding 
> value (if such exists, or undef. The following two lines are equivalent:
> 
>    $val = $r->subprocess_env($key);
>    $val = $r->subprocess_env->get($key);
> 
> 
> Ok... Seems simple enough...
> 
> In my module if I do the following:
> 
> $r->subprocess_env;
> my $uri = $ENV{REQUEST_URI};
> 
> The I get the URI.
> 
> But if I change the above to:
> 
> my $uri = $r->subprocess_env('REQUEST_URI');
> 
> I get undef.
> 
Tosh, do you know what VOID context means in perl?

@list=function()      # this list context
$scalar=function()    # this is scalar context
function()            # this is void context: the return value is ignored

Now, in void context and only then subprocess_env() calls

       ap_add_common_vars(r);
       ap_add_cgi_vars(r);

These 2 functions add such things like REQUEST_URI to the environment.

So, if you do it like this:

       $r->subprocess_env;       # void context
       my $uri = $r->subprocess_env('REQUEST_URI');

it is very likely that you get the REQUEST_URI.

But as David pointed out, $r->uri is the much better way.

Torsten