[PHP] echo SESSION var doesn't work if unset after echo

[Eric Wood]

 I set Ecomm to a little javascript code on the previous page then echo it no 
the next page.  
session_cache_limiter ('private, must-revalidate');
session_start();

..... stuff ...
 if(isset($_SESSION["Ecomm"])) {
    echo $_SESSION["Ecomm"];
    unset($_SESSION["Ecomm"]);
 }

..... stuff ...

For some unknown reason echoing this particular session var is now blank and 
the page's source code proves that it is missing.

Now when I comment out the unset statement, then the crazy thing works.  I see 
the code in the page's source.

It is as if php is doing this:

if(isset($_SESSION["Ecomm"])) {
   unset($_SESSION["Ecomm"]);
   echo $_SESSION["Ecomm"];
}

No kernel, apache, or php updates have happened.   An there's not errors 
logged.   Truely strange.   Any ideas?


-Eric Wood