PHP errors: Compilation failed: this version of PCRE is not compiled with PCRE_UTF8 support

Issue

• The following PHP errors are observed in logs while trying to access a dokuwiki web page.

[Thu Mar 29 14:19:45 2012] [error] [client 192.168.0.12] PHP Warning:  preg_replace() 
[<a href='function.preg-replace'>function.preg-replace</a>]: Compilation failed: this 
version of PCRE is not compiled with PCRE_UTF8 support at offset 0 in /web/docs/dokuw
iki/inc/utf8.php on line 422, referer: https://test.htmlserver.com/dokuwiki/doku.php

• The above error message reports that PHP is not compiled with PCRE_UTF8 support, but the pcretest -C command output shows that PCRE is compiled with UTF-8 support:

$ pcretest -C
PCRE version 6.6 06-Feb-2006
Compiled with
  UTF-8 support                 <------
  Unicode properties support
  Newline character is LF
  Internal link size = 2
  POSIX malloc threshold = 10
  Default match limit = 10000000
  Default recursion depth limi