Turn out that it is the encoding issue. So what I do is i use below solution. Below function will detect what type of string that being received and convert it into the same type.
iconv(mb_detect_encoding($text, mb_detect_order(), true), "UTF-8", $text);
Solution here
Solution Reference
http://stackoverflow.com/questions/4164719/utf-8-encoding-xml-in-php
http://stackoverflow.com/questions/152006/change-mime-type-of-output-in-php
http://php.net/utf8_encode
http://stackoverflow.com/questions/1354263/how-to-load-xml-when-php-cant-indicate-the-right-encoding
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