PHP 4.0 Bug #9029 Updated: preg_split inconsistency
| From: | anil at recoil dot org | Date: | Wed, 31 Jan 2001 14:17:43 +0000 |
| Subject: | PHP 4.0 Bug #9029 Updated: preg_split inconsistency | ||
| Groups: | php.dev | ||
| Request: | Send a blank email to php-dev+get-45453@lists.php.net to get a copy of this message | ||
ID: 9029
User Update by: anil@recoil.org
Old-Status: Closed
Status: Open
Bug Type: PCRE related
Description: preg_split inconsistency
I'm afraid that doesn't seem to work either (I tried that, but neglected to mention it in
my original report)
[avsm@total avsm]$ php -v
4.0.4pl1
[avsm@total avsm]$ cat split.php
<?
$a = '(define heshe (if (equal gender "Male") "He" "She"))
';
$b = preg_split('/([\\(\\)])/', $a);
var_dump($b);
?>
[avsm@total avsm]$ php split.php
X-Powered-By: PHP/4.0.4pl1
Content-type: text/html
array(7) {
[0]=>
string(0) ""
[1]=>
string(13) "define heshe "
[2]=>
string(3) "if "
[3]=>
string(19) "equal gender "Male""
[4]=>
string(11) " "He" "She""
[5]=>
string(0) ""
[6]=>
string(1) " "
}
Previous Comments:
---------------------------------------------------------------------------
[2001-01-31 08:43:34] derick@php.net
You have to escape the 's (as per hint from Wico de Leeuw)
---------------------------------------------------------------------------
[2001-01-31 08:13:21] anil@recoil.org
While trying to write a simple Scheme parser in PHP, we encountered this problem:
In perl, you can capture the delimiters passed to split() by enclosing the portion with brackets, in
the regexp. This does not work in PHP.
For example, here is the perl script, and its output:
#!/usr/bin/perl
use Data::Dumper;
$_ = '(define heshe (if (equal gender "Male") "He" "She"))
';
@b = split /([()])/;
print Dumper(@b);
Output:
$VAR1 = '';
$VAR2 = '(';
$VAR3 = 'define heshe ';
$VAR4 = '(';
$VAR5 = 'if ';
$VAR6 = '(';
$VAR7 = 'equal gender "Male"';
$VAR8 = ')';
$VAR9 = ' "He" "She"';
$VAR10 = ')';
$VAR11 = '';
$VAR12 = ')';
$VAR13 = ' ';
But in PHP:
<? $a = '(define heshe (if (equal gender "Male") "He" "She"))
';
$b = preg_split('/([()])/', $a);
var_dump($b); ?>
Outputs:
array(7) {
[0]=>
string(0) ""
[1]=>
string(13) "define heshe "
[2]=>
string(3) "if "
[3]=>
string(19) "equal gender "Male""
[4]=>
string(11) " "He" "She""
[5]=>
string(0) ""
[6]=>
string(1) " "
}
The brackets aren't captured, which makes the Scheme parsing a bit difficult :-) There are
other ways to do this, of course, but the preg_split() would be the simplest and the most efficient
way to do it, as far as we can see.
I noticed that the PCRE libraries are only at version 3.0 in PHP, and that 3.4 is available from the
main site. I'll try updating to that, and see if it solves this.
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Full Bug description available at: http://bugs.php.net/?id=9029