About Baidu Post bar coding

I think that Baidu's search and post may be a code for Baidu's coding, but for this feature of @ people, the @ ID does not support this encoding, that is, UTF-8 encoding. The following is an example: in Baidu search engine, wd = is followed by the search term encoding, if I want to search for "Post Bar Building Committee", it will be % E8 % B4 % B4 % E5 % 90% A7 % E6 % about Baidu Post bar code.
I thought that Baidu's search and post bar may be a code, but the @ ID cannot use this code for this feature, that is, UTF-8 encoding. The following is an example:
In Baidu search engine, wd = is followed by the search term code. if I want to search for "Post Bar Building Committee ", % E8 % B4 % B4 % E5 % 90% A7 % E6 % A5 % BC % E5 % A7 % 94% E4 % BC % 9A
However, the Post @ % E8 % B4 % B4 % E5 % 90% A7 % E6 % A5 % BC % E5 % A7 % 94% E4 % BC % 9A in the post will not be connected to the Post building. the Commission will go above this ID, I checked the link, http://tieba.baidu.com/ I /sys/jump? Un = % CC % F9 % B0 % C9 % C2 % A5 % CE % AF % BB % E1, which is obviously a string after un =, I tried several codes but they were not suitable. so I would like to ask if you have any idea about them? Or Baidu internal code? Thank you ~

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Echo urlencode (iconv ('utf-8', 'gbk', 'post Bar Committee '));

% CC % F9 % B0 % C9 % C2 % A5 % CE % AF % BB % E1


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It has been verified that this is the result of gbk code: the code of the Board Building Committee.