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modulo in PERl vs PHP

Demerzel
Novice

Dec 20, 2012, 6:44 AM

Post #1 of 9 (1355 views)

modulo in PERl vs PHP	Can't Post

I have two pices of code in PERL:

Code

		my $cc = '2521';	 
		my $format = '%0'.(24 - $acclen) .'d'; 
		print "format:".$format."\n"; 
		$account .= sprintf($format, $row->{'id'}); 
		my $numer=$account.$cc.'00'; 
		print " ".$numer."="; 
		print "modulo:".($numer% 97);die(); 
		$account= sprintf('%02d', 98-($numer% 97)).$account; 
		print "konto:".$account;

and PHP:

Code

		$cc = '2521';	// Kod kraju - Polska 
		$format = '%0'.(24 - $acclen) .'d'; 
		print $format; 
		$account .= sprintf($format, $id); 
		print " ".$account.$cc.'00'."=".bcmod($account.$cc.'00', 97); 
		return sprintf('%02d', 98-bcmod($account.$cc.'00', 97)).$account;

$account.$cc. and $account.$cc.'00' are equal but ($numer% 97) and bcmod($account.$cc.'00', 97) are different. Any idea why?

FishMonger
Veteran / Moderator

Dec 20, 2012, 7:55 AM

Post #2 of 9 (1352 views)

Re: [Demerzel] modulo in PERl vs PHP [In reply to]	Can't Post

The simple answer is that the bcmod() function does not use the exact same method to calculate the modulus as Perl's modulus operator.

I have not looked at the related C source code of either language, but obviously they need to preform division which returns a floating point number which then is either truncated or rounded to an integer. If it is rounded, is it being rounded up or down (POSIX ceil or floor)?

Why are you stringifying the numbers and unnecessarily using concatenation? PHP might need to use that inefficiency, but Perl doesn't.

(This post was edited by FishMonger on Dec 20, 2012, 7:59 AM)

Demerzel
Novice

Dec 20, 2012, 8:51 AM

Post #3 of 9 (1346 views)

Re: [FishMonger] modulo in PERl vs PHP [In reply to]	Can't Post

PHP code is not my. In fact I cant change it. Question is how to get the same result in perl. I could start php script from perl and get result back. But I would like to do it without another script.

FishMonger
Veteran / Moderator

Dec 20, 2012, 9:00 AM

Post #4 of 9 (1343 views)

Re: [Demerzel] modulo in PERl vs PHP [In reply to]	Can't Post

At the moment I don't have a system with php to test the differences, so what value does the bcmod function return and how does that differ from what you're getting from Perl? +1 or -1

(This post was edited by FishMonger on Dec 20, 2012, 9:01 AM)

Demerzel
Novice

Dec 21, 2012, 3:46 AM

Post #5 of 9 (1332 views)

Re: [FishMonger] modulo in PERl vs PHP [In reply to]	Can't Post

Pointless!

Tried different approach

Code

my $account = system("php /var/www/lms/inetgroup.sdom/branches/scripts/account.php $row->{'id'} $row->{'account'}");

Inside php resut is fine but I cant pass value back to perl.

FishMonger
Veteran / Moderator

Dec 21, 2012, 6:07 AM

Post #6 of 9 (1326 views)

Re: [Demerzel] modulo in PERl vs PHP [In reply to]	Can't Post

The system function returns the exit code of the program, not its output.

You need to use the `` backticks or qx() operator. You can learn about them in perldoc perlop

Code

my $account = `php /var/www/lms/inetgroup.sdom/branches/scripts/account.php $row->{'id'} $row->{'account'}`;

Code

my $account = qx("php /var/www/lms/inetgroup.sdom/branches/scripts/account.php $row->{'id'} $row->{'account'}");

Demerzel
Novice

Dec 21, 2012, 6:38 AM

Post #7 of 9 (1320 views)

Re: [FishMonger] modulo in PERl vs PHP [In reply to]	Can't Post

By now I should be used to this.
You play smart but in the end it is alweys to hard to give straight answer. Waist of time with you guys.

FishMonger
Veteran / Moderator

Dec 21, 2012, 6:43 AM

Post #8 of 9 (1318 views)

Re: [Demerzel] modulo in PERl vs PHP [In reply to]	Can't Post

What are you talking about? I gave you straight answers.

You are the one that left out key info that would have helped in providing the answer you were looking for.

Laurent_R
Enthusiast / Moderator

Dec 21, 2012, 2:36 PM

Post #9 of 9 (1301 views)

Re: [Demerzel] modulo in PERl vs PHP [In reply to]	Can't Post

In Reply To

By now I should be used to this.
You play smart but in the end it is alweys to hard to give straight answer. Waist of time with you guys.

What a nice way to thank people who are spending their valuable time trying to help you!!!!!!

If that is the way you are grateful with people helping you, I'll certainly not waste my time any further.

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