Re: [PHP] strcmp()?
On Monday 23 May 2011 15:00:27 tedd wrote:
Are you absolutely certain about that?
echo strcmp('These are nearly equal', 'These are almost equal'), \n;
echo strcmp('different', 'unequal'), \n;
echo strcmp('b', 'a'), br /\n;
My result is:
13 -17 1
I'm runninng PHP 5.2.14 on the ARM Linux with uClibc.
Certainly the result depends on architecture and/or libc, because PHP just
calls system strcmp, nothing more.
So. to write compatible scripts one should check 0, not == -1.
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Re: [PHP] strcmp()?
On Tue, May 24, 2011 at 12:48 AM, Vitalii Demianets vi...@nppfactor.kiev.ua wrote: So. to write compatible scripts one should check 0, not == -1. Which matches the documentation: Returns 0 if str1 is less than str2; 0 if str1 is greater than str2, and 0 if they are equal. David
Re: [PHP] strcmp()?
At 11:10 AM -0700 5/24/11, David Harkness wrote: On Tue, May 24, 2011 at 12:48 AM, Vitalii Demianets vi...@nppfactor.kiev.ua wrote: So. to write compatible scripts one should check 0, not == -1. Which matches the documentation: Returns 0 if str1 is less than str2; 0 if str1 is greater than str2, and 0 if they are equal. David David: I think the point here is that the documentation says the function returns a number greater than zero, or less than zero, or zero. It's just that many who have responded on this list show that the function commonly returns -1, 1, and 0. It's wise to keep with the documentation. Cheers, tedd -- --- http://sperling.com/ -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] strcmp()?
At 8:13 AM + 5/23/11, Ford, Mike wrote:
-Original Message-
From: tedd [mailto:tedd.sperl...@gmail.com]
On Sat, 21 May 2011 09:26:02 -0400, tedd wrote:
The function strcmp() simply evaluates two strings and reports
back -1, 0, or 1 depending upon their alphabetical relationship.
It might do that, but don't bet your horse on it.
http://se.php.net/manual/en/function.strcmp.php
/Nisse
It works that way for me.
Are you absolutely certain about that?
echo strcmp('These are nearly equal', 'These are almost equal'), \n;
echo strcmp('different', 'unequal'), \n;
echo strcmp('b', 'a'), br /\n;
Result:
13
-17
1
The description of the function merely says that the result is 0, 0 or 0
-- it makes no promises about the actual value when it is non-zero.
Mike
Mike:
That's interesting. Try the same comparisons here:
http://www.webbytedd.com/lcc/citw229/string-compare.php
For me they are 1, -1, and 1.
Someone with more smarts than me* will have to figure this one out.
Cheers,
tedd
PS: * I can hear the peanut gallery saying That won't be hard. :-)
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Re: [PHP] strcmp()?
On May 23, 2011, at 8:00 AM, tedd wrote:
At 8:13 AM + 5/23/11, Ford, Mike wrote:
-Original Message-
From: tedd [mailto:tedd.sperl...@gmail.com]
On Sat, 21 May 2011 09:26:02 -0400, tedd wrote:
The function strcmp() simply evaluates two strings and reports
back -1, 0, or 1 depending upon their alphabetical relationship.
It might do that, but don't bet your horse on it.
http://se.php.net/manual/en/function.strcmp.php
/Nisse
It works that way for me.
Are you absolutely certain about that?
echo strcmp('These are nearly equal', 'These are almost equal'), \n;
echo strcmp('different', 'unequal'), \n;
echo strcmp('b', 'a'), br /\n;
Result:
13
-17
1
The description of the function merely says that the result is 0, 0 or 0
-- it makes no promises about the actual value when it is non-zero.
Mike
Mike:
That's interesting. Try the same comparisons here:
http://www.webbytedd.com/lcc/citw229/string-compare.php
For me they are 1, -1, and 1.
Someone with more smarts than me* will have to figure this one out.
Cheers,
tedd
PS: * I can hear the peanut gallery saying That won't be hard. :-)
--
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Might that have something to do with the version of PHP running?
Regards,
-Josh
Joshua Kehn | josh.k...@gmail.com
http://joshuakehn.com
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Re: [PHP] strcmp()?
Mike: That's interesting. Try the same comparisons here: http://www.webbytedd.com/lcc/citw229/string-compare.php For me they are 1, -1, and 1. Might that have something to do with the version of PHP running? -Josh -Josh: I've written this on two different servers. One is Version 5.2.15 and the other is version 5.2.5 and they both report the same results. Cheers, tedd -- --- http://sperling.com/ -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] strcmp()?
On May 23, 2011, at 8:17 AM, tedd wrote: Mike: That's interesting. Try the same comparisons here: http://www.webbytedd.com/lcc/citw229/string-compare.php For me they are 1, -1, and 1. Might that have something to do with the version of PHP running? -Josh -Josh: I've written this on two different servers. One is Version 5.2.15 and the other is version 5.2.5 and they both report the same results. Cheers, tedd I just checked under 5.3.2 and it gives the same -1, 0, 1 results. Regards, -Josh Joshua Kehn | josh.k...@gmail.com http://joshuakehn.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP] strcmp()?
[snip][/snip] 5.2.9 yields -1, 0, 1 -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP] strcmp()?
-Original Message-
From: Joshua Kehn [mailto:josh.k...@gmail.com]
Sent: 23 May 2011 13:04
On May 23, 2011, at 8:00 AM, tedd wrote:
At 8:13 AM + 5/23/11, Ford, Mike wrote:
echo strcmp('These are nearly equal', 'These are almost
equal'), \n;
echo strcmp('different', 'unequal'), \n;
echo strcmp('b', 'a'), br /\n;
Result:
13
-17
1
The description of the function merely says that the result is
0, 0 or 0
-- it makes no promises about the actual value when it is non-
zero.
Mike
Mike:
That's interesting. Try the same comparisons here:
http://www.webbytedd.com/lcc/citw229/string-compare.php
For me they are 1, -1, and 1.
Someone with more smarts than me* will have to figure this one
out.
Cheers,
tedd
PS: * I can hear the peanut gallery saying That won't be hard.
:-)
--
---
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Might that have something to do with the version of PHP running?
Possibly -- or even the result returned by the underlying C strcmp()
for any given architecture/compiler combination, which would like as
not be even more variable.
I think the lesson is, if writing portable code, always allow for
results which might be outside of the [-1, 0, 1] set.
(Incidentally, tedd, your test script has the signs the wrong way
round in the output; plus which they should be lt; gt; anyway; plus
plus which, you are not applying htmlspecialchars() or whatever to
your echoed user input, so values such as
!--
break your page, and I'm sure something more malicious could be cooked
up were I so inclined... :( .)
Cheers!
Mike
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Portland Way, LEEDS, LS1 3HE, United Kingdom
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Re: [PHP] strcmp()?
On 23 May 2011 13:24, Joshua Kehn josh.k...@gmail.com wrote:
On May 23, 2011, at 8:17 AM, tedd wrote:
Mike:
That's interesting. Try the same comparisons here:
http://www.webbytedd.com/lcc/citw229/string-compare.php
For me they are 1, -1, and 1.
Might that have something to do with the version of PHP running?
-Josh
-Josh:
I've written this on two different servers.
One is Version 5.2.15 and the other is version 5.2.5 and they both report
the same results.
Cheers,
tedd
I just checked under 5.3.2 and it gives the same -1, 0, 1 results.
Regards,
-Josh
Joshua Kehn | josh.k...@gmail.com
http://joshuakehn.com
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Just tested the code below on Windows, using official releases (and
some RCs also).
?php
echo
PHP_VERSION, ' ',
strcmp('These are nearly equal', 'These are almost equal'), ' ',
strcmp('different', 'unequal'), ' ',
strcmp('b', 'a');
?
And for all of the V4 and V5 releases I've got, the result is the same...
-1 1 -1
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Re: [PHP] strcmp()?
I checked on php 5.2.4-2 (ubuntu5.12). It returns 1,-1,1
On Mon, May 23, 2011 at 4:00 PM, tedd t...@sperling.com wrote:
At 8:13 AM + 5/23/11, Ford, Mike wrote:
-Original Message-
From: tedd [mailto:tedd.sperl...@gmail.com]
On Sat, 21 May 2011 09:26:02 -0400, tedd wrote:
The function strcmp() simply evaluates two strings and reports
back -1, 0, or 1 depending upon their alphabetical relationship.
It might do that, but don't bet your horse on it.
http://se.php.net/manual/en/function.strcmp.php
/Nisse
It works that way for me.
Are you absolutely certain about that?
echo strcmp('These are nearly equal', 'These are almost equal'), \n;
echo strcmp('different', 'unequal'), \n;
echo strcmp('b', 'a'), br /\n;
Result:
13
-17
1
The description of the function merely says that the result is 0, 0 or 0
-- it makes no promises about the actual value when it is non-zero.
Mike
Mike:
That's interesting. Try the same comparisons here:
http://www.webbytedd.com/lcc/citw229/string-compare.php
For me they are 1, -1, and 1.
Someone with more smarts than me* will have to figure this one out.
Cheers,
tedd
PS: * I can hear the peanut gallery saying That won't be hard. :-)
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With regards,
Alexei Bovanenko
Re: [PHP] strcmp()?
On May 23, 2011, at 9:28 AM, Alex Nikitin wrote: There is an interesting note in the comments for strcmp: Well, I am using PHP 4.0 and both strcmp and strcasecmp appear to be giving me very arbitrary and incomprehensible results. When I input strings, it appears that equal strings return 1, as well as some unequal strings, and that if the first argument is smaller then I *tend* to get negative numbers, but sometimes I get 1, and if larger I *tend* to get numbers larger than 1.. Guessing that earlier versions of php 4 and before would give the results that would have values other then 1, 0, -1, i looked through the change log, but nothing immediately jumped out, there was a lot of mbstring work done, and they did add the nat comparison functions, and play with the pcre engine a bit, which could have caused this as an unintended result for a few versions, i think though it was a bug at some point, so, maybe a php dev would chime in if they remember...? -- Alex -- -- The trouble with programmers is that you can never tell what a programmer is doing until it’s too late. ~Seymour Cray All this confusion makes me glad that I'm using === for equality checks instead of strcmp. Regards, -Josh Joshua Kehn | josh.k...@gmail.com http://joshuakehn.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP] strcmp()?
At 1:06 PM + 5/23/11, Ford, Mike wrote: (Incidentally, tedd, your test script has the signs the wrong way round in the output; plus which they should be lt; gt; anyway; plus plus which, you are not applying htmlspecialchars() or whatever to your echoed user input, so values such as !-- break your page, and I'm sure something more malicious could be cooked up were I so inclined... :( .) Mike Mike: Thanks. The which way the arrows point thing is because I'm dyslexic. While I know that a appears before b, it's difficult for me to think of 'a' being less than 'b' -- UNLESS -- I think in terms of their ASCII values and then everything makes sense -- but that's a step away from deciding or . IOW, it's a two step process for me to realize which way the arrows point. As for the htmlspecialchars(), you are absolutely right. The demo was for my students and I didn't want to confuse them. However, I have changed the code to htmlentities(). They probably should start learning basic security from the get-go (as should I). Cheers, tedd -- --- http://sperling.com/ -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] strcmp()?
At 9:32 AM -0400 5/23/11, Joshua Kehn wrote: All this confusion makes me glad that I'm using === for equality checks instead of strcmp. -Josh -Josh: Yes, but what if you were sorting? I know you could use sort(), but there might be logic where a strcmp() would better solve the problem. Cheers, tedd -- --- http://sperling.com/ -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] strcmp()?
On Mon, May 23, 2011 at 9:32 AM, Joshua Kehn josh.k...@gmail.com wrote: On May 23, 2011, at 9:28 AM, Alex Nikitin wrote: There is an interesting note in the comments for strcmp: Well, I am using PHP 4.0 and both strcmp and strcasecmp appear to be giving me very arbitrary and incomprehensible results. When I input strings, it appears that equal strings return 1, as well as some unequal strings, and that if the first argument is smaller then I *tend* to get negative numbers, but sometimes I get 1, and if larger I *tend* to get numbers larger than 1.. Guessing that earlier versions of php 4 and before would give the results that would have values other then 1, 0, -1, i looked through the change log, but nothing immediately jumped out, there was a lot of mbstring work done, and they did add the nat comparison functions, and play with the pcre engine a bit, which could have caused this as an unintended result for a few versions, i think though it was a bug at some point, so, maybe a php dev would chime in if they remember...? -- Alex -- -- The trouble with programmers is that you can never tell what a programmer is doing until it’s too late. ~Seymour Cray All this confusion makes me glad that I'm using === for equality checks instead of strcmp. Regards, -Josh Joshua Kehn | josh.k...@gmail.com http://joshuakehn.com It depends on what you need to check, josh :) If you wanted to say find an anagram, or do a search with some typo correction, strcmp can be many times more helpful then a ===, that said comparing 2 strings to be equal === works about 20% quicker, so it works better for comparing two strings for equality (or unequality) anyways. There is no confusion, strcmp has a documented way in which it is to work in posix-compliant languages, ISO/IEC 9899:1999, 7.21.4.2, so as long as you follow the ISO guidelines for the scrcmp checking, your code should work correctly... -- The trouble with programmers is that you can never tell what a programmer is doing until it’s too late. ~Seymour Cray
RE: [PHP] strcmp()?
-Original Message- From: tedd [mailto:tedd.sperl...@gmail.com] Sent: 23 May 2011 14:41 The which way the arrows point thing is because I'm dyslexic. While I know that a appears before b, it's difficult for me to think of 'a' being less than 'b' -- UNLESS -- I think in terms of their ASCII values and then everything makes sense -- but that's a step away from deciding or . IOW, it's a two step process for me to realize which way the arrows point. Yes, I remember you mentioning being dyslexic a few times on this list before, which is partly why it was only an incidentally at the end. We have a pretty hot disability and dyslexia unit here who don't shrink from telling me what's good and what's bad about our website! And, just for the record re the strcmp() debate, I'm on PHP 5.2.5, SunOS 5.10. Cheers! Mike -- Mike Ford, Electronic Information Developer, Libraries and Learning Innovation, Leeds Metropolitan University, C507 City Campus, Portland Way, LEEDS, LS1 3HE, United Kingdom E: m.f...@leedsmet.ac.uk T: +44 113 812 4730 To view the terms under which this email is distributed, please go to http://disclaimer.leedsmet.ac.uk/email.htm -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] strcmp()?
On May 23, 2011, at 9:45 AM, tedd wrote: At 9:32 AM -0400 5/23/11, Joshua Kehn wrote: All this confusion makes me glad that I'm using === for equality checks instead of strcmp. -Josh -Josh: Yes, but what if you were sorting? I know you could use sort(), but there might be logic where a strcmp() would better solve the problem. Cheers, tedd -- --- http://sperling.com/ Never encountered an issue using sort() as-is. Regards, -Josh Joshua Kehn | josh.k...@gmail.com http://joshuakehn.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] strcmp()?
On May 23, 2011, at 9:47 AM, Alex Nikitin wrote: It depends on what you need to check, josh :) If you wanted to say find an anagram, or do a search with some typo correction, strcmp can be many times more helpful then a ===, that said comparing 2 strings to be equal === works about 20% quicker, so it works better for comparing two strings for equality (or unequality) anyways. There is no confusion, strcmp has a documented way in which it is to work in posix-compliant languages, ISO/IEC 9899:1999, 7.21.4.2, so as long as you follow the ISO guidelines for the scrcmp checking, your code should work correctly... -- The trouble with programmers is that you can never tell what a programmer is doing until it’s too late. ~Seymour Cray It's good to know it's functionality is available in the case that I ever need it. Regards, -Josh Joshua Kehn | josh.k...@gmail.com http://joshuakehn.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] strcmp()?
On 23 May 2011 14:28, Alex Nikitin niks...@gmail.com wrote: There is an interesting note in the comments for strcmp: Well, I am using PHP 4.0 and both strcmp and strcasecmp appear to be giving me very arbitrary and incomprehensible results. When I input strings, it appears that equal strings return 1, as well as some unequal strings, and that if the first argument is smaller then I *tend* to get negative numbers, but sometimes I get 1, and if larger I *tend* to get numbers larger than 1.. Guessing that earlier versions of php 4 and before would give the results that would have values other then 1, 0, -1, i looked through the change log, but nothing immediately jumped out, there was a lot of mbstring work done, and they did add the nat comparison functions, and play with the pcre engine a bit, which could have caused this as an unintended result for a few versions, i think though it was a bug at some point, so, maybe a php dev would chime in if they remember...? 4.0.0 1 -1 1 4.0.1 1 -1 1 4.0.1 1 -1 1 4.0.2 1 -1 1 4.0.3 1 -1 1 4.0.4 1 -1 1 4.0.4pl1 1 -1 1 4.0.5 1 -1 1 4.0.6 1 -1 1 4.1.0 1 -1 1 4.1.1 1 -1 1 4.1.2 1 -1 1 4.2.0 1 -1 1 4.2.1 1 -1 1 4.2.2 1 -1 1 4.2.3RC1 1 -1 1 4.2.3RC2 1 -1 1 4.2.3 1 -1 1 4.3.0-pre2 1 -1 1 4.3.0RC1 1 -1 1 4.3.0RC2 1 -1 1 4.3.0RC3 1 -1 1 4.3.0RC4 1 -1 1 4.3.0 1 -1 1 4.3.1 1 -1 1 4.3.10 1 -1 1 4.3.11 1 -1 1 4.3.2-RC1 1 -1 1 4.3.2-RC2 1 -1 1 4.3.2RC3 1 -1 1 4.3.2 1 -1 1 4.3.3RC1 1 -1 1 4.3.3RC2 1 -1 1 4.3.3RC3 1 -1 1 4.3.3RC4 1 -1 1 4.3.3 1 -1 1 4.3.4RC1 1 -1 1 4.3.4RC2 1 -1 1 4.3.4RC3 1 -1 1 4.3.4 1 -1 1 4.3.5RC1 1 -1 1 4.3.5RC2 1 -1 1 4.3.5RC3 1 -1 1 4.3.5RC4 1 -1 1 4.3.5 1 -1 1 4.3.6RC1 1 -1 1 4.3.6RC2 1 -1 1 4.3.6RC3 1 -1 1 4.3.6 1 -1 1 4.3.7RC1 1 -1 1 4.3.7 1 -1 1 4.3.8 1 -1 1 4.3.9RC1 1 -1 1 4.3.9 1 -1 1 4.4.0 1 -1 1 4.4.1 1 -1 1 4.4.2 1 -1 1 4.4.3 1 -1 1 4.4.4 1 -1 1 4.4.5 1 -1 1 4.4.6 1 -1 1 4.4.7 1 -1 1 4.4.8 1 -1 1 4.4.9 1 -1 1 All the official versions of PHP 4 (and some RCs) for Windows. All give the same response. Must me a platform issue also. -- Richard Quadling Twitter : EE : Zend : PHPDoc @RQuadling : e-e.com/M_248814.html : bit.ly/9O8vFY : bit.ly/lFnVea -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] strcmp() versus ==
I had never completely read over the rules with regard to comparisons in PHP, and was recently alarmed to find that $str1 == $str2 might not compare the way I thought they would. Is it common practice among PHP coders to use strcmp() instead of == in making string comparisons? Or am I missing/misreading something? Paul -- Paul M. Foster -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] strcmp($var1, $var2) versus if ($var1 $var2)
Hi All, I must be overlooking something here ... $var1 = 01011090; $var2 = 010190; // 2 strings if ($var1 $var2) ECHO var1 var2; else ECHO var1 = var2; echo br /; $r = strcmp ( $var1 , $var2 ); if ($r 0) ECHO var1 var2, br /; 2nd line says: $var1 = $var2 4th line says: $var1 $var2 TIA, Cor
Re: [PHP] strcmp($var1, $var2) versus if ($var1 $var2)
2008/5/28 C.R.Vegelin [EMAIL PROTECTED]:
$var1 = 01011090; $var2 = 010190; // 2 strings
if ($var1 $var2) ECHO var1 var2; else ECHO var1 = var2; echo br
/;
$r = strcmp ( $var1 , $var2 );
if ($r 0) ECHO var1 var2, br /;
2nd line says: $var1 = $var2
4th line says: $var1 $var2
Implicit type conversion. is a numeric operator, so your strings
are silently promoted to integers, where (1011090 10190).
strcmp() treats the strings as strings, and orders them in something
close to ASCII order (which isn't the same as alphabetical ordering,
BTW, and see the comments at www.php.net/strcmp for locale-specific
gotchas).
PHP's implicit conversions can bite you if you don't understand them.
Try this one:
$a = 'string';
$b = 0;
if ($a==true $b==false $a==$b)
{
echo ('universe broken');
}
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Re: [PHP] strcmp($var1, $var2) versus if ($var1 $var2)
- Original Message -
From: David Otton [EMAIL PROTECTED]
To: C.R.Vegelin [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED] php-general@lists.php.net
Sent: Wednesday, May 28, 2008 12:11 PM
Subject: Re: [PHP] strcmp($var1, $var2) versus if ($var1 $var2)
2008/5/28 C.R.Vegelin [EMAIL PROTECTED]:
$var1 = 01011090; $var2 = 010190; // 2 strings
if ($var1 $var2) ECHO var1 var2; else ECHO var1 = var2; echo
br /;
$r = strcmp ( $var1 , $var2 );
if ($r 0) ECHO var1 var2, br /;
2nd line says: $var1 = $var2
4th line says: $var1 $var2
Implicit type conversion. is a numeric operator, so your strings
are silently promoted to integers, where (1011090 10190).
strcmp() treats the strings as strings, and orders them in something
close to ASCII order (which isn't the same as alphabetical ordering,
BTW, and see the comments at www.php.net/strcmp for locale-specific
gotchas).
PHP's implicit conversions can bite you if you don't understand them.
Try this one:
$a = 'string';
$b = 0;
if ($a==true $b==false $a==$b)
{
echo ('universe broken');
}
Hi David,
I already suspected that the operator forced a numeric comparison.
Even if I use: if ((string) $var1 (string) $var2) ...
So I have to use strcmp()
Thanks, Cor
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