From: oliver at teqneers dot de
Operating system: Suse Linux 10/Debian Sarge
PHP version: 5.1.2
PHP Bug Type: *General Issues
Bug description: strange comparison on 64bit AMD
Description:
------------
When operating at or beyond the integer limits, there is a different
behaviour between a 32bit and 64bit processor (beside the different max
value of course).
on a 32bit processor the limit is 2147483647, on a 64bit it is
9223372036854775807.
if i try to compare a STRING value like "9223372036854775807" with a
string value "9223372036854775808", which is higher, than the integer
limit, the comparison between those two returns true, but it should be
false.
This problem seems also to exists in PHP 4.4.x.
Reproduce code:
---------------
64-BIT-Source:
--------------
<?
echo 'max<br>';
echo PHP_INT_MAX.'<br>';
echo 'intval<br>';
echo intval(9223372036854775807).'<br>';
echo intval(9223372036854775808).'<br>';
echo intval(9223372036854775809).'<br>';
echo intval(9223372036854776832).'<br>';
echo intval(9223372036854776833).'<br>';
echo 'intval of string<br>';
echo intval('9223372036854775807').'<br>';
echo intval('9223372036854775808').'<br>';
echo intval('9223372036854775809').'<br>';
echo intval('9223372036854776832').'<br>';
echo intval('9223372036854776833').'<br>';
echo 'compares<br>';
if( '9223372036854775808' == '9223372036854775807' ) {
echo 'wrong<br>';
}
if( '9223372036854775808' == '9223372036854775806' ) {
echo 'wrong<br>';
}
if( 9223372036854775808 == 9223372036854775806 ) {
echo 'wrong<br>';
}
if( strval('9223372036854775808') == strval('9223372036854775806') ) {
echo 'wrong<br>';
}
if( (string)'9223372036854775808' == (string)'9223372036854775806' ) {
echo 'wrong<br>';
}
if( (string)'9323372036854775806' == (string)'9223372036854775806' ) {
echo 'works fine<br>';
}
?>
32-BIT-Source:
--------------
<?
echo 'max<br>';
echo PHP_INT_MAX.'<br>';
echo 'intval<br>';
echo intval(2147483647).'<br>';
echo intval(2147483648).'<br>';
echo intval(2147483649).'<br>';
echo intval(2147483650).'<br>';
echo intval(2147483651).'<br>';
echo 'intval of string<br>';
echo intval('2147483647').'<br>';
echo intval('2147483648').'<br>';
echo intval('2147483649').'<br>';
echo intval('2147483650').'<br>';
echo intval('2147483651').'<br>';
echo 'compares<br>';
if( '2147483648' == '2147483647' ) {
echo 'wrong<br>';
}
if( '2147483648' == '2147483646' ) {
echo 'wrong<br>';
}
if( 2147483648 == 2147483646 ) {
echo 'wrong<br>';
}
if( strval('2147483648') == strval('2147483646') ) {
echo 'wrong<br>';
}
if( (string)'2147483648' == (string)'2147483646' ) {
echo 'wrong<br>';
}
?>
Expected result:
----------------
should be more or less equal to the 32-bit output, except of a higher
number of course.
Actual result:
--------------
64-BIT-Source:
--------------
max
9223372036854775807
intval
9223372036854775807
-9223372036854775808
-9223372036854775808
-9223372036854775808
-9223372036854773760
intval of string
9223372036854775807
9223372036854775807
9223372036854775807
9223372036854775807
9223372036854775807
compares
wrong
wrong
wrong
wrong
wrong
32-BIT-Source:
--------------
max
PHP_INT_MAX
intval
2147483647
-2147483648
-2147483647
-2147483646
-2147483645
intval of string
2147483647
2147483647
2147483647
2147483647
2147483647
compares
--
Edit bug report at http://bugs.php.net/?id=37082&edit=1
--
Try a CVS snapshot (PHP 4.4):
http://bugs.php.net/fix.php?id=37082&r=trysnapshot44
Try a CVS snapshot (PHP 5.1):
http://bugs.php.net/fix.php?id=37082&r=trysnapshot51
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=37082&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=37082&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=37082&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=37082&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=37082&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=37082&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=37082&r=support
Expected behavior: http://bugs.php.net/fix.php?id=37082&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=37082&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=37082&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=37082&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=37082&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=37082&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=37082&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=37082&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=37082&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=37082&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=37082&r=mysqlcfg
