[drupal-devel] [feature] New API function: truncate_utf8_conc

Goba drupal-devel at drupal.org
Fri Apr 29 19:58:19 UTC 2005

Issue status update for http://drupal.org/node/21576

 Project:      Drupal
 Version:      cvs
 Component:    base system
 Category:     feature requests
 Priority:     normal
 Assigned to:  Bèr Kessels
 Reported by:  Bèr Kessels
 Updated by:   Goba
 Status:       patch

Strlen() will return the number of bytes used to represent the string,
eg. strlen("Bèr") will return 4, contrary to the fact that it seems to
be three characters. This makes truncating very much arbitrary, ie. you
will get strings of varying length with the same parameters if you have
non single byte chars in them. This looks odd if you use the data in a
table column or something.


Previous comments:

April 29, 2005 - 11:46 : Bèr Kessels

Attachment: http://drupal.org/files/issues/common_inc_truncate_utf8_conc.diff (1.63 KB)

This function truncates the string, but adds a string to the end, when
requested. For example to concenate three dots (...) to a long

For example to turn the long username
 * johndoe at www.personalweblog.com into johndoe at www.johndo...

Its possible with the current truncate_utf8(), but than you need to do
string comparison and some more truncation afterwards, which is not

And please mark this as wontfix if not appropriate. I do not have time
to maintain this patch, so if its not up to standards or so, just close
this issue.


April 29, 2005 - 15:36 : Dries

You can update existing code (e.g. like format_name()) to take advantage
of this patch:

$ grep -r "truncate_utf8" * | grep '\.\.\.'
includes/common.inc:      $name = truncate_utf8($object->name, 15)
modules/search.module:    return truncate_utf8($text, 256) . ' ...';

Also, $conc is not very descriptive as variable name.  Maybe call is
$postfix instead?


April 29, 2005 - 15:52 : Bèr Kessels

Attachment: http://drupal.org/files/issues/common_inc_truncate_utf8_conc_0.diff (2.82 KB)

I updated the function to use the better name $postfix. Also, I changed
the two places where these three dots were appended in a custom way.


April 29, 2005 - 19:03 : Goba

My first thought was that this should be integrated into truncate_utf8()
and I still think so. Having a separate function seems to be inadequate
to me. Also noticed that truncate_utf8() - and as a result, this
suggested function - is broken in that the passed length is not
properly used. If you have multibyte characters in the string, strlen()
will not return the number of chars but the number of bytes used to
represent them (except if you have mbstring overrides, but that is not


April 29, 2005 - 19:38 : Bèr Kessels


I do not really understand the second patr of your post. Do you mean
that truncate_utf8() is broken, or that truncate_utf8_conc() will not
work() ? If the latter, could you please provide some help and tell me
what should be changed or where I should look?


April 29, 2005 - 20:06 : Dries

Integrating this in the existing truncate_utf8 function sounds like the
better solution.

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