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Date: Thu, 28 Jul 2011 20:20:34 +0200
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To: Laruence <laruence@php.net>
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Subject: Re: [PHP-DEV] [RFC]strn(case)cmp supporting negative length as third
 parameter
From: keisial@gmail.com ("=?UTF-8?B?w4FuZ2VsIEdvbnrDoWxleg==?=")

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Laruence wrote:
> Hi:
>
>    strn(case)cmp dosen't  support a negative length as its third
> paramter,  while substr dose.

>   here is the rfc: https://wiki.php.net/rfc/strncmpnegativelen
>
>   any question? plz worte me back.
>
>   thanks

What do you exactly mean by "in the reverse order" in
> if the abs of the negative length is greater than any strlen of the 
> first two parameters, then strn(case)cmp will work as strncmp in the 
> reverse order with the abs value: 

Looking at
> var_dump  <http://www.php.net/var_dump>(strncmp  <http://www.php.net/strncmp>("prefix_num",  "num",  -10));
>    //outpu: int(7)
it seems to mean that it would be equivalent to
> var_dump(strncmp("mun_xiferp", "mun", 10));

However, if I'm reading the patch correctly, it would
be taking the smaller string. Ie. it would be equivalent
to

> var_dump  <http://www.php.net/var_dump>(strncmp  <http://www.php.net/strncmp>("prefix_num",  "num",  -3));

Seems an implementation bug.


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