From: mchenryc at gmail dot com
Operating system: Windows XP
PHP version: 5CVS-2007-02-16 (snap)
PHP Bug Type: Output Control
Bug description: json_encode integer conversion is inconsistent with PHP
Description:
------------
json_encode converts integers to string in a different way than PHP's
integer to string conversion (at least on win32). PHP appears to either
handle unsigned values, or use more bits to encode integers, where as
json_encode converts them to floats, causing rounding errors.
Reproduce code:
---------------
function show_eq($x,$y) {
echo "$x ". ($x==$y ? "==" : "!=") ." $y\n";
}
$value = 0x7FFFFFFF; #2147483647;
show_eq("$value", json_encode($value));
$value++;
show_eq("$value", json_encode($value));
Expected result:
----------------
2147483647 == 2147483647
2147483648 == 2147483648
Which shows both functions handling unsigned (or "long") integers.
Or:
2147483647 == 2147483647
2147483650 == 2147483650
Which shows both functions converting to a float with less precision.
Actual result:
--------------
2147483647 == 2147483647
2147483648 != 2147483650
My code makes use of the "long" or "unsigned" (not sure what's actually
happening) ability of PHP for unix timestamps, which I would dearly love
to see stay. The real issue is that the two functions behave in different
ways, and should not.
--
Edit bug report at http://bugs.php.net/?id=40503&edit=1
--
Try a CVS snapshot (PHP 4.4):
http://bugs.php.net/fix.php?id=40503&r=trysnapshot44
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=40503&r=trysnapshot52
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=40503&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=40503&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=40503&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=40503&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=40503&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=40503&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=40503&r=support
Expected behavior: http://bugs.php.net/fix.php?id=40503&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=40503&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=40503&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=40503&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=40503&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=40503&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=40503&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=40503&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=40503&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=40503&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=40503&r=mysqlcfg
