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Bug #20969 Bitwise NOT (~): wrong results on Linux
Submitted: 2002-12-12 12:39 UTC Modified: 2002-12-13 07:27 UTC
From: neuj60 at yahoo dot de Assigned:
Status: Not a bug Package: *Math Functions
PHP Version: 4CVS-20021213 OS: i386 Redhat Linux
Private report: No CVE-ID: None
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From: neuj60 at yahoo dot de
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 [2002-12-12 12:39 UTC] neuj60 at yahoo dot de
The Bitwise NOT operator ~ doesn't fuinction correctly on the Linux system.

~-2222222222 = 2147483647
~4180982798 = 2147483647

But on a Windows 2000 Server it functions well:

~-2222222222 = -2072745075
~4180982798 = 113984497

On both systems PHP 4.2.2 is used.

If that's a "feature" then PHP is not usable for any bitwise operation.


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 [2002-12-12 14:45 UTC]
Although bitwise operators are not expected to use with float values, the reported behaviour is quite inconsistent.
Possible documentation problem?
 [2002-12-13 07:27 UTC]
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at and the instructions on how to report
a bug at

This behaviour is mentioned in the manual.

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