Graph API new feed post object-Attachment not showing

I am assuming user gave the permission for user_photos / friends_photos. Since you have the photo_id, you may try this.

$pic = $facebook->api("/PHOTO_ID");$pic_url = $pic->source;$attachment =  array(    'access_token' => USER_ACCESS_TOKEN,    'message'      => "...",    'caption'      => "...",    'name'         => "...",    'description'  => "...",    'link'         => URL,    'picture'      => $pic_url);

ADDED

You need to store the image some where locally ,in a local server . due to this article

I think the 'object_attachment'=>$photo_id won't work any more.You should change it to 'picture'=>$photo_url

$photo_Url = "link to your photo";//Valid Facebook Photo ID...        $facebook = new Facebook($config);$attachment =  array(        'access_token' => $user_token,        'message' => "Test Message",        'caption' => "THis is a Caption",        'name' => "Test Name",        'description' => "This is a description",        'link' => 'http://url.com/',        'picture' => $photo_Url,);$response = $facebook->api("/".$userID."/feed/", 'POST', $attachment);

You can find more Here

you have to permission pubish_stream on your app and then try this using curl:-

$attachment =  array(        'access_token' => $access_token,        'message' => 'i m success to using graph api for post wall',        'name' => 'Wall Post using graph api',        'link' => 'www.mysite.com',        'description' => 'Using the Graph API, any Facebook users Wall feed may be accessed by using this URL:',        'picture'=>'http://example.com/images/noimage.png' );$url = "https://graph.facebook.com/$facebook_id/feed";$ch = curl_init();curl_setopt($ch, CURLOPT_URL,$url);curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);curl_setopt($ch, CURLOPT_POST, true);curl_setopt($ch, CURLOPT_POSTFIELDS, $attachment);curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);  //to suppress the curl output$result = curl_exec($ch);curl_close ($ch);print_r($result)