How does facebook do this?

[diabolo]

http://www.facebook.com/inbox/?compose&ref=mb

how does FB pass "compose" in php?

because the variable compose is not set to anything.

 

[misson]

because the variable compose is not set to anything.

If you mean $compose, it's not set unless register_globals is on. If you mean $_REQUEST['compose'] and $_GET['compose'], they're set to the empty string. Use isset() or array_keys($_REQUEST) to make the 'compose' input parameter useful.

if (isset($_REQUEST['compose'])) {
  ...
}

 

[diabolo]

thank you mission
that is exactly the kind of answer i needed

may be closed now.