I don't know chinese language. But I faced problem using these codes:
iconv('UTF-8', 'GB2312', '在世界自由软件日给中国自由软件爱好者的视');
runs ok with no problem.
and this one:
iconv('UTF-8', 'GB2312', '冠軍集團安心居台北旗艦總店開幕酒會暨記者會');
which causes error:
Message: iconv(): Detected an illegal character in input string
Both are chinese but what's the difference?