Description:
------------
It would be nice if empty() would accept multiple arguments 
like isset() does.  It would be functionally equivalent to:

empty(var) || empty(var2) ... || empty(varN)

Reproduce code:
---------------
<?php
$a = 1;
if (empty($a, $b, $c)) {
    echo 'Either $a, $b or $c was empty/did not exist.';
}
?>

Expected result:
----------------
Either $a, $b or $c was empty/did not exist.

Actual result:
--------------
parse error, unexpected ',', expecting ')' in /.../file.php on 
line 3