if set variable unfamiliar language

[Edho P Arief]

On Thu, Dec 17, 2009 at 5:48 PM, nerdgrind <nginx-forum at nginx.us> wrote:
> I see http://wiki.nginx.org/NginxHttpRewriteModule now, but I am still unsure about how some of the logic works. For example the follow rewrite code block allows YOURLS to be properly used with Nginx, but I don't see how this flows logically.:
>
>
>                                if (!-f $request_filename){
>                                        set $rule_0 1$rule_0;
>                                }
>                                if (!-d $request_filename){
>                                        set $rule_0 2$rule_0;
>                                }
>                                if ($rule_0 = "21"){
>                                rewrite ^/([0-9a-z]+)/?$ /yourls-go.php?id=$1 last;
>                                }
>

also read try_files for such task

location ~ ^/([\da-z]+)/?$
{
  try_files $uri $uri/ /yourls-go.php?id=$1;
}

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