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Request #50083 Bit shift
Submitted: 2009-11-04 23:27 UTC Modified: 2010-12-20 09:29 UTC
From: talk at apfeldot dot de Assigned:
Status: Wont fix Package: *General Issues
PHP Version: 5.3.0 OS: Win 7
Private report: No CVE-ID: None
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From: talk at apfeldot dot de
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 [2009-11-04 23:27 UTC] talk at apfeldot dot de 
Description:
------------
I think there is an integer overflow, which should be prevented.

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

var_dump(1 << 33);

?>

Expected result:
----------------
There should be int(0), because the 1 was shifted out of the integer representation and the binary code should be 00000...00000.

Actual result:
--------------
int(2)
Binary represantation: 00...0010

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 [2010-12-20 09:29 UTC] jani@php.net
-Status: Open +Status: Wont fix -Package: Feature/Change Request +Package: *General Issues
 [2010-12-20 09:29 UTC] jani@php.net 
http://www.php.net/manual/en/language.operators.bitwise.php

There's big warning with note:

"Use functions from the gmp extension for bitwise manipulation on numbers beyond PHP_INT_MAX."
 
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