测试用户是否发布了 Facebook 个人资料图片，如果是，是否检索它？
验证用户是否已放入 Facebook 个人资料图片（即非默认图片）的正确方法是什么？如果是，则检索它？
这个： 如何判断Facebook用户上传的是个人资料图片还是默认的？讲了一种方法，但作者自己说这是一个不好的方法：
public static function hasProfilePicture($fbuid)
{
/* Really stupid method to test if Facebook user has real profile picture
* based on FB returning a gif when you request a large photo.
* Use with care - for every profile there's an outgoing request! */
$r = get_headers("http://graph.facebook.com/$fbuid/picture?type=square");
return !array_search("Content-Type: image/gif",$r);
}
What is the correct way of verifying that a user has put in a facebook profile picture (ie the non-default one), and if so, to retrieve it?
This: How to determine if a Facebook user has uploaded a profile picture or its default? talks about a method, but the author himself says that its a bad method:
public static function hasProfilePicture($fbuid)
{
/* Really stupid method to test if Facebook user has real profile picture
* based on FB returning a gif when you request a large photo.
* Use with care - for every profile there's an outgoing request! */
$r = get_headers("http://graph.facebook.com/$fbuid/picture?type=square");
return !array_search("Content-Type: image/gif",$r);
}
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如果用户有个人资料照片，则可以通过
http://graph.facebook.com//picture 访问它。例如， http://graph.facebook.com/gauravgupta.in/picture 重定向到特定的 URL 并显示我的 Facebook 个人资料图片。但是，如果用户没有个人资料图片，上述 URL 将被重定向到标准占位符图像的 URL，当前为 http://profile.ak.fbcdn.net/static-ak/rsrc.php/v1/yo/r/UlIqmHJn- SK.gif
这绝对不是一个可靠的方法，但在 Facebook 决定改变它之前它会一直有效。
If a user HAS a profile photo, it can be accessed via
http://graph.facebook.com/<facebook username>/picture. For example, http://graph.facebook.com/gauravgupta.in/picture redirects to a specific URL and shows my Facebook profile picture.However, if a user does NOT have a profile picture, the above URL gets redirected to the URL of the standard placeholder image, which is currently http://profile.ak.fbcdn.net/static-ak/rsrc.php/v1/yo/r/UlIqmHJn-SK.gif
It's definitely not a reliable way, but will work till Facebook decides to change it.