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[2011-08-10 18:20 UTC] phpbugs at ch dot pkts dot ca
Description:
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I'd created a fake email code fragment:
e-mail: foo.<?php echo base_convert(time(),10,36).".".base_convert(ip2long($_SERVER['REMOTE_ADDR']),10,36) ?>@mydomain.com
However, long2ip(base_convert("cxcapb",36,10)) gave the wrong answer (should be 209.105.205.209, got 46.150.50.47)
It turns out that base_convert(...,10,36) should have returned -cxcapb instead of cxcapb, since ip2long("209.105.205.209") = -781595183 and ip2long("46.150.50.47") = 781595183.
At this point, I'm not sure if there's legions of programs that work around this bug and would be broken by a fix.
Test script:
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$a=base_convert(-781595183,10,36);
if (base_convert($a,36,10) != -781595183) { echo "fail\n"; } else { echo "success\!"; }
Expected result:
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success!
Actual result:
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fail
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Last updated: Wed Aug 12 06:01:25 2020 UTC |
Hi There's a simpler example: php -r 'print(base_convert(-5, 10, 2));' 101 So '-' is omitted. $ php -v PHP 5.5.9-1ubuntu4.4 (cli) (built: Sep 4 2014 06:57:30) Copyright (c) 1997-2014 The PHP Group Zend Engine v2.5.0, Copyright (c) 1998-2014 Zend Technologies with Zend OPcache v7.0.3, Copyright (c) 1999-2014, by Zend Technologies uname -a Linux Oleg 3.13.0-34-generic #60-Ubuntu SMP Wed Aug 13 15:49:09 UTC 2014 i686 i686 i686 GNU/Linux This is why it happens: https://github.com/php/php-src/blob/php-5.5.9/ext/standard/math.c#L869 any char except '0'..'9', 'a'..'z', 'A'..'Z' is simp ly left out without warnings :-(