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Bug #54530 strnatcasecmp treats alphanumeric values before symbols
Submitted: 2011-04-14 12:59 UTC Modified: 2011-04-19 08:46 UTC
From: chatfielddaniel at googlemail dot com Assigned:
Status: Not a bug Package: Strings related
PHP Version: Irrelevant OS: Windows 7
Private report: No CVE-ID: None
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From: chatfielddaniel at googlemail dot com
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 [2011-04-14 12:59 UTC] chatfielddaniel at googlemail dot com 
Description:
------------
---
From manual page: http://www.php.net/function.strnatcasecmp
---
The strnatcasecmp is set that '_' is after letters and numbers which is illogical 
and should be changed.

Test script:
---------------
echo strnatcasecmp('1','2');//-1
echo strnatcasecmp('_','2');//1 (incorrect)
echo strnatcasecmp('_','a');//1 (incorrect)
echo strnatcasecmp('a','b');//-1
echo strnatcasecmp(2,'a');//-1

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 [2011-04-19 08:46 UTC] aharvey@php.net
-Status: Open +Status: Bogus -Package: Unknown/Other Function +Package: Strings related
 [2011-04-19 08:46 UTC] aharvey@php.net 
Just like all of the other comparison functions, strnatcmp() and strnatcasecmp() eventually fall back to a straight byte value by byte value comparison if the "natural" alphanumeric sorting logic isn't triggered. Since the underscore character has a higher character code than any number or uppercase letter (and case-insensitive comparisons are done on uppercased strings), it's always "after" letters and numbers.

This behaviour isn't going to change.
 
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