[PHP] split behaviour differences in perl and php
This stumped me badly in my present project. Is this a bug or a feature in
PHP? I am trying to split a string into two, where only one half (and the
delimiter) is present.
IN PERL
==
[EMAIL PROTECTED] ~]$ cat s1.pl
@t = split(/,/ , a,b);
$len = $#t + 1;
print $len\n;
@t = split(/,/, a,);
$len = $#t + 1;
print $len\n;
[EMAIL PROTECTED] sql]$ perl s1.pl
2
1
IN PHP
===
[EMAIL PROTECTED] ~]$ cat s1.php
?php
print count(split(',', 'a,b')).\n;
print count(split(',', 'a,')).\n;
?
[EMAIL PROTECTED] sql]$ php -q s1.php
2
2
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Sandip Bhattacharya*Puroga Technologies * [EMAIL PROTECTED]
Work: http://www.puroga.com* Home: http://www.sandipb.net
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BLISS is ignorance.
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Re: [PHP] split behaviour differences in perl and php
Sandip Bhattacharya wrote:
This stumped me badly in my present project. Is this a bug or a feature in
PHP? I am trying to split a string into two, where only one half (and the
delimiter) is present.
[ trim ]
IN PHP
===
[EMAIL PROTECTED] ~]$ cat s1.php
?php
print count(split(',', 'a,b')).\n;
print count(split(',', 'a,')).\n;
?
[EMAIL PROTECTED] sql]$ php -q s1.php
2
2
If your expand your example slightly, as I did, you will see why you are
getting the expected results:
[EMAIL PROTECTED] burhan $ cat s1.php
?php
$results = split(',', 'a,b');
print_r($results);
print count($results).\n;
$results = split(',','a,');
print_r($results);
print count($results).\n;
?
[EMAIL PROTECTED] burhan $ php -q s1.php
Array
(
[0] = a
[1] = b
)
2
Array
(
[0] = a
[1] =
)
2
As you can see, the array contains an empty second element because
(correctly) there isn't a second element after the last ,.
So, is this a bug? Not from my point of view. Its more bad input,
expected result :)
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Re: [PHP] split behaviour differences in perl and php
* Thus wrote Sandip Bhattacharya:
This stumped me badly in my present project. Is this a bug or a feature in
PHP? I am trying to split a string into two, where only one half (and the
delimiter) is present.
IN PERL
==
[EMAIL PROTECTED] ~]$ cat s1.pl
@t = split(/,/ , a,b);
$len = $#t + 1;
print $len\n;
@t = split(/,/, a,);
$len = $#t + 1;
print $len\n;
[EMAIL PROTECTED] sql]$ perl s1.pl
2
1
IN PHP
===
[EMAIL PROTECTED] ~]$ cat s1.php
?php
print count(split(',', 'a,b')).\n;
print count(split(',', 'a,')).\n;
?
[EMAIL PROTECTED] sql]$ php -q s1.php
2
2
split in php isn't the same as perl's split, there is preg_split()
which you can use:
$results = preg_split('/,/','a,', -1, PREG_SPLIT_NO_EMPTY);
print(count($results)); // outputs: 1
Curt
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RE: [PHP] split behaviour differences in perl and php
PHP's string manipulation functions (such as split()) are not guaranteed to
behave exactly like in PERL. The functions that are prefixed by 'preg_' are
(PERL REG (EX)) guaranteed to some extent and well documented where preg_
functions are not PERL compliant.
So, its not a bug, its just PHP being its own language.
Cheers,
Andrew Martinez
RubyBay Inc.
-Original Message-
From: Curt Zirzow [mailto:[EMAIL PROTECTED]
Sent: Thursday, September 16, 2004 10:45 AM
To: [EMAIL PROTECTED]
Subject: Re: [PHP] split behaviour differences in perl and php
* Thus wrote Sandip Bhattacharya:
This stumped me badly in my present project. Is this a bug or a feature
in
PHP? I am trying to split a string into two, where only one half (and
the
delimiter) is present.
IN PERL
==
[EMAIL PROTECTED] ~]$ cat s1.pl
@t = split(/,/ , a,b);
$len = $#t + 1;
print $len\n;
@t = split(/,/, a,);
$len = $#t + 1;
print $len\n;
[EMAIL PROTECTED] sql]$ perl s1.pl
2
1
IN PHP
===
[EMAIL PROTECTED] ~]$ cat s1.php
?php
print count(split(',', 'a,b')).\n;
print count(split(',', 'a,')).\n;
?
[EMAIL PROTECTED] sql]$ php -q s1.php
2
2
split in php isn't the same as perl's split, there is preg_split()
which you can use:
$results = preg_split('/,/','a,', -1, PREG_SPLIT_NO_EMPTY);
print(count($results)); // outputs: 1
Curt
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The above comments may offend you. flame at will.
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PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] split behaviour differences in perl and php
* Thus wrote Sandip Bhattacharya:
This stumped me badly in my present project. Is this a bug or a feature
in
PHP? I am trying to split a string into two, where only one half (and
the
delimiter) is present.
IN PERL
==
[EMAIL PROTECTED] ~]$ cat s1.pl
@t = split(/,/ , a,b);
$len = $#t + 1;
print $len\n;
@t = split(/,/, a,);
$len = $#t + 1;
print $len\n;
[EMAIL PROTECTED] sql]$ perl s1.pl
2
1
IN PHP
===
[EMAIL PROTECTED] ~]$ cat s1.php
?php
print count(split(',', 'a,b')).\n;
print count(split(',', 'a,')).\n;
?
[EMAIL PROTECTED] sql]$ php -q s1.php
2
2
split in php isn't the same as perl's split, there is preg_split()
which you can use:
$results = preg_split('/,/','a,', -1, PREG_SPLIT_NO_EMPTY);
print(count($results)); // outputs: 1
Curt
Would explode() provide the same technique?
$var = a,;
$results = explode(,, $var);
$results[0] = a;
--
--Matthew Sims
--http://killermookie.org
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