ID: 47774
User updated by: vivekanandan8 at yahoo dot com
Reported By: vivekanandan8 at yahoo dot com
Status: Bogus
Bug Type: Scripting Engine problem
Operating System: Debian
PHP Version: 5.2CVS-2009-03-25 (snap)
New Comment:
Hi,
Thanks for your information.but when the overflow occurs at the
runtime, then also the data type conversion does not change.
Ex:
<?
$vValue = -2147483649;
var_dump($vValue); //output: float(-2147483649)
$vValue++;
var_dump($vValue);//output: float(-2147483648)
$vValue++;
var_dump($vValue);//output: float(-2147483647)
?>
Initially $vValue is double , but even later execution it is not
converted to integer when it can hold values.
when the overflow occurs we convert from long to double but i fell
it is not done from double to long.
Hence in the function increment_function(zend_operators.c)
we have to add the validation as follows
case IS_DOUBLE:
if(op1->value.dval == LONG_MIN) {
op1->value.lval = (long) op1->value.dval+1;
op1->type = IS_LONG;
}else{
op1->value.dval = op1->value.dval + 1;
}
Previous Comments:
------------------------------------------------------------------------
[2009-03-25 16:15:16] matt...@php.net
This is the expected behavior. Happens because it's not parsed as a
single negative number, but a positive number (and 2147483648 needs to
be a float) that is then negated afterwards. So it's treated more like
-(2147483648). Hope that helps explain what's going on. :-)
------------------------------------------------------------------------
[2009-03-25 14:28:33] vivekanandan8 at yahoo dot com
Description:
------------
Generally when integer number exceed(overflows), it is converted to
float,But for the number -2147483648 the Integer can hold, but converted
to float.
Reproduce code:
---------------
<?
$vValue = (int)-2147483648;
var_dump($vValue);
$vValue = -2147483648;
var_dump($vValue);
?>
Expected result:
----------------
int(-2147483648) int(-2147483648)
Actual result:
--------------
int(-2147483648) float(-2147483648)
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=47774&edit=1
