Description:
------------
"Table 10-1. Operator Precedence" and "Table 10-2. Arithmetic Operators" tables do not include the "unary minus" operator although it exists in php.

Please add itt to the two table above.

Thanx

Reproduce code:
---------------
<?
$a = 1;
$a = -$a;
echo $a;
?>

Expected result:
----------------
PARSE error as there's no unary minus operator according to the docs

Actual result:
--------------
ouputs "-1"