It seems that session_unregister() should "remove" a var
from the session, isn't it ?

-------test.php
<?php
// First script, register the var
session_start() ;
session_register("somevar") ;
$HTTP_SESSION_VARS["somevar"] = "abc" ;
?>
<a href="test2.php">Click Here</a>

-------test2.php
<?php
// Second script, unregister the var
session_start() ;
echo "somevar is " . $HTTP_SESSION_VARS["somevar"] ;
session_unregister("somevar") ;
?>
<br><a href="test3.php">Click here again</a>

--------test3.php
<?php
// The third script, see the result
session_start() ;
print_r($HTTP_SESSION_VARS) ;
session_unset() ;
print_r($HTTP_SESSION_VARS) ;
session_destroy() ;
?>

With the enable-trans-sid turned on, the result of the third
script is :
Array ( [somevar] => abc ) Array ( )

Is it a bug ?
How shoud I do if I want to "remove" some variables from
session but KEEP THE OTHERS unchanged ?

Best Regards