Description:
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We use the strnatcasecmp()-function to get a "natural order" in our 
lists of items. Up until PHP 5.2.9 it worked like a charm, but since we 
upgraded to PHP 5.2.11 the order seems to have been changed.

The natural order is used in our case to support the sorting of items 
that have been prefixed with numbers (0, 1, 2, etc). This is exactly 
where the problem arises: 0 should be "sorted" before 1, but this is no 
longer the case.

This problem also occurs in the latest snapshot of PHP 5.3

Reproduce code:
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<?php

$string1 = '0 Foo';
$string2 = '1 Bar';

var_dump(strnatcasecmp($string1, $string2));

Expected result:
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int(-1)

Actual result:
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int(1)