Can you tell us, for which URL you get this error?

Yes, for example:
http://pear.php.net/manual/ru/pecl.imagick.php
Short examination shows that this warning can be found at any page of russian version of the manual.

And there is another one issue about manual:
english version of http://pear.php.net/manual/ru/pecl.imagick.php contains only words "Table of Contents" at the bottom, while russian version contains non-translated function reference. Is it ok?

KOI8-R is supported since 4.3.0, we should upgrade?

Here is a patch that could hide the warning until we fix the real problem:

Index: pear-manual.php
===================================================================
RCS file: /repository/pearweb/include/pear-manual.php,v
retrieving revision 1.21
diff -u -u -r1.21 pear-manual.php
--- pear-manual.php     28 May 2003 18:00:09 -0000      1.21
+++ pear-manual.php     31 Jul 2003 09:37:01 -0000
@@ -104,13 +104,13 @@

     echo '<tr><td>';
     if ($PREV[1]) {
-        print_link( $PREV[0] , make_image('caret-l.gif', 'previous') .  htmlspecialchars($PREV[1],ENT_QUOTES,$CHARSET) ) ;
+        print_link( $PREV[0] , make_image('caret-l.gif', 'previous') .  @htmlspecialchars($PREV[1],ENT_QUOTES,$CHARSET) ) ;
     }
     echo '<br /></td>';

     echo '<td align="right">';
     if ($NEXT[1]) {
-        print_link( $NEXT[0] , htmlspecialchars($NEXT[1],ENT_QUOTES,$CHARSET)  . make_image('caret-r.gif', 'next') ) ;
+        print_link( $NEXT[0] , @htmlspecialchars($NEXT[1],ENT_QUOTES,$CHARSET)  . make_image('caret-r.gif', 'next') ) ;
     }
     echo '<br /></td>';
     echo '</tr>';

no, support of KOI8-R was added only in 4.3.2.
of course, @ is a possible solution, but not the best imho.

It's already used in the same file and it was only forgot in 2 places.

Btw there is nothing else that can be used...

>It's already used in the same file and it was only forgot in 2 places.
aha..
got it.

>Btw there is nothing else that can be used...
why upgrade is not acceptable solution?

We'll update PHP as soon as possible (or move to another machine, whatever comes next). For now the patch seems to be sufficient. (I'll apply it later.)

We'll update PHP as soon as possible (or move to another machine, whatever comes next). For now the patch seems to be sufficient. (I'll apply it later.)

This bug has been fixed in CVS.

In case this was a PHP problem, snapshots of the sources are packaged
every three hours; this change will be in the next snapshot. You can
grab the snapshot at http://snaps.php.net/.
 
In case this was a documentation problem, the fix will show up soon at
http://www.php.net/manual/.

In case this was a PHP.net website problem, the change will show
up on the PHP.net site and on the mirror sites in short time.
 
Thank you for the report, and for helping us make PHP better.