php - HTTP_Request_2 :: addPostParameter adds extra characters

Question

So I'm trying to send a POST request with pear HTTP_Request_2

I'm adding a POST parameter to a request with addPostParameter function

$request->addPostParameter(array(
         'lgname'=>'Admin',
         'lgpassword'=>'xxx','lgtoken'=>$xmlresponse->login['token']
                        ));

however some extra characters appear in POST request body:

lgname=Admin&lgpassword=xxx&lgtoken%5B0%5D=6b9c078a99d5e9821ccaa8b3d41bfdef

uri decode says that %5B0%5D is [0] so it looks like lgtoken[0]=6b9c078a99d5e9821ccaa8b3d41bfdef

, but how does this appear here?? How to get rid of it?\

I need just lgtoken=6b9c078a99d5e9821ccaa8b3d41bfdef