[php] i can't post new posts to my blogger

 $api_key = {api key};
$token_id = {token};
$arr['blog_id'] = {blogger id};
$arr['tag'] = {tag]';
$arr['title'] = {title};
$arr['content']= {content};
 $url = 
"https://www.googleapis.com/blogger/v3/blogs/".$arr['blog_id']."/posts?fields=id&key=".$api_key;
$hand = array("Content-Type:  application/json","Authorization:  Bearer 
".$token_id);
$content = array(
"title"=>$arr['title'],
'labels'=>explode (',',$arr['tag']),
"content"=>$arr['content']
);
$content=json_encode($content);
print_r($url);
echo "<br>";
print_r($hand);
echo "<br>";
print_r($content);
echo "<br>";
 $ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, $hand);
curl_setopt($ch, CURLOPT_POSTFIELDS ,$content);
curl_setopt($curl, CURLOPT_RETURNTRANSFER,1);  
$re = curl_exec($ch);
var_dump($re);
curl_close($ch);

this is my php code, i try curl post my blog, but is not insert.
i don't know why.

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