测试用户是否发布了Facebook个人资料图片，如果是，则进行检索？

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);
}