problem with UTF-8 in xmlrpc_encode_request

Hello,

I’m using the XML-RPC to add posts,and it’s works great But characters not correct (utf-8)

I’m using this code:

function wpPostXMLRPC($title,$body,$rpcurl,$username,$password,$category,$keywords='',$encoding='UTF-8') {
    $title = htmlentities($title,ENT_NOQUOTES,$encoding);
    $keywords = htmlentities($keywords,ENT_NOQUOTES,$encoding);
    $content = array(
        'title'=>$title,
        'description'=>$body,
        'mt_allow_comments'=>1,  // 1 to allow comments
        'mt_allow_pings'=>1,  // 1 to allow trackbacks
        'post_type'=>'post',
        'mt_keywords'=>$keywords,
		/*'_aioseop_keywords'=>"keyword",
		'aioseop_title'=>"title",
		'_aioseop_title'=>"title",
		'_aioseop_description'=>"description",*/
		"custom_fields" => array(
array( 'key' => 'try', 'value' => 'these are keywords' ),
array( 'key' => '_test', 'value' => 'this is the title' )
		),
        'categories'=>array($category)
    );
    $params = array(0,$username,$password,$content,true);
    $request = xmlrpc_encode_request('metaWeblog.newPost',$params);
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_POSTFIELDS, $request);
    curl_setopt($ch, CURLOPT_URL, $rpcurl);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_TIMEOUT, 1);
    $results = curl_exec($ch);
    curl_close($ch);
    return $results;

utf-8 not working in the code.

if anyone can help, I will be grateful

thank you,