Merging two vB3 forums - import avatars question - I have stuck

[Scandal]

Hello all!

I'm building my own vB3 merge tool for personal use since Impex is not compatible with PHP 7.

I have stuck to the following code.

We have a vB3 forum which saving the avatars on the database (source forum) and the destination forum which is saving the avatars on the file system.

PHP Code:

// make connection with source forum database
$es = new mysqli('localhost', 'root', '', 'es_db');

// fetching users for merge == it takes also the avatar data
$users = $es->query("
        SELECT _vbuser.*, customavatar.filename AS afilename, customavatar.filedata AS afiledata, customavatar.filedata_thumb AS afiledata_thumb,
            customprofilepic.filename AS pfilename, customprofilepic.filedata AS pfiledata,
            sigpic.filename AS sfilename, sigpic.filedata AS sfiledata
        FROM _vbuser
        LEFT JOIN _vbcustomavatar AS customavatar ON (_vbuser.userid = customavatar.userid)
        LEFT JOIN _vbcustomprofilepic AS customprofilepic ON (_vbuser.userid = customprofilepic.userid)
        LEFT JOIN _vbsigpic AS sigpic ON (_vbuser.userid = sigpic.userid)        
        ORDER BY _vbuser.userid
        LIMIT ". intval($vbulletin->GPC['perpage']) ."
    ");
    
while ($user = $db->fetch_array($users))
{    
    $userdm = datamanager_init('User', $vbulletin, ERRTYPE_CP);
    // doing things [...]
    $userdm->pre_save(); 
    $userid = $userdm->save();    
    
    // $userid is the new account userid on the destination forum // I want to get the Avatar data ("afiledata") and upload it to destination file system

    // Converting FROM mysql TO fs
    # !!!
    $vbulletin->options['usefileavatar'] = true;
    if (!empty($user['afiledata']))
    {
        $userpic = datamanager_init('Userpic_Avatar', $vbulletin, ERRTYPE_CP, 'userpic');
        $userpic->set_condition("userid = " . $userid);
        $userpic->setr('filedata', $user['afiledata']);
        $pictureid = $userpic->save();
    }    
} 


# !!! code is not working Any idea?