how to take the url to became a variable

[eluser]jedd[/eluser]
You could, and arguably should, instead just do this:

Code:

function choose_testi ( $id = 0 )
    {
     echo $id;      // should show '4'
         ...

With your cited URL of : http://localhost/ci2/adminpage/choose_testi/4 , the variable $id gets a value of 4. If your URL has no number after 'choose_testi' then $id is set to 0.

EDIT: Accidentally left the urisegment assign in there .. whoops!