function unicodeString($str, $encoding=null) {
return preg_replace_callback('/\\\\u([0-9a-fA-F]{4})/u', create_function('$match', 'return mb_convert_encoding(pack("H*", $match[1]), "utf-8", "UTF-16BE");'), $str);
}
echo unicodeString("\u6bcf\u4e2a\u4e8c\u7ef4\u7801\u4ec5\u9650\u4f7f\u7528\u4e00\u6b21\uff0c\u8bf7\u5237\u65b0\u518d\u8bd5");
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