php curl http header authorization in google blogger api

there has few articles about google blogger api, so i have some question 
about it. I have access passing OAuth 2.0, get access token like ya29., now 
how to use access token, api key,user_id, to get blogger user info, blogger 
user post?

I am not find any examples use Google_BloggerService.php, so i tried use 
curl code below:

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,"https://www.googleapis.com/blogger/v3/users/".$user_id."/blogs?key=".$api_key);
curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
$header = array();
$header[] = 'Content-length: 0';
$header[] = 'Content-type: application/json';
$header[] = 'Authorization:'.$access_token;
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION,1);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
$html = curl_exec($ch);
curl_close($ch);
echo $html;

But always return: { "error": { "errors": [ { "domain": "global", "reason": "required", "message": "Login Required", "locationType": "header", "location": "Authorization" } ], "code": 401, "message": "Login Required" } } I have no idea how to solve it, maybe some one could help me out of this question, Thanks and regards.


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