Description:
------------
There is a gross inconsistency between how the increment and decrement operators function.  If you increment an empty variable, the operations works correctly.  However, if you *decrement* an empty variable, the operation leaves it unchanged!  See for yourself, with my clear example...

Reproduce code:
---------------
<?php

//  Increment some blank/empty variables...
$pos++; $pos++; $pos++;
$neg--; $neg--; $neg--;
//  Show them to us now...
print( "pos = $pos\n" );
print( "neg = $neg\n" );

//  Now do it another way (forced typecast)...
$ppp += 1; $ppp += 1; $ppp += 1;
$nnn -= 1; $nnn -= 1; $nnn -= 1;
//  Show them to us now...
print( "ppp = $ppp\n" );
print( "nnn = $nnn\n" );

#
#  Expected:
#    pos = 3    ppp = 3
#    neg = -3   nnn = -3
#
#  Actual:
#    pos = 3    ppp = 3
#    neg =      nnn = -3
?>


Expected result:
----------------
#
#  Expected:
#    pos = 3    ppp = 3
#    neg = -3   nnn = -3


Actual result:
--------------
#
#  Actual:
#    pos = 3    ppp = 3
#    neg =      nnn = -3

(note that $neg-- fails!)