change your php document encoding to 'ANSI'
for example: you can rename your php document to txt document,
and open your txt document,and save as to ANSI
another way:
you can use a function in php 5.0
iconv('UTF-8','GBK','中文')
that's mean change ‘中文’ encoding 'UTF-8' to 'GBK'
it's easy to use this function before you want to change chinese encoding.