Array Inserts null Values in Database

I have the following Arrays, but it keeps inserting null values into database whenever the script is run


Code:
   stdClass Object
(
    [id] => 3341234
    [id_str] => 33414123
    [email] => Chi@gmail.com
    [screen_name] => chibaco
    [location] => 
    [description] => 
    [url] => 
    [entities] => stdClass Object
        (
            [description] => stdClass Object
                (
                    [urls] => Array
                        (
                        )

                )

        )

    [protected] => 
    [followers_count] => 8
    [friends_count] => 41
    [listed_count] => 0
    [created_at] => Mon Jun 22 14:59:08 +0000 2015
    [favourites_count] => 0
    [utc_offset] => 
    [time_zone] => 
    [geo_enabled] => 
    [verified] => 
    [statuses_count] => 0
    [lang] => en
    [contributors_enabled] => 
    [is_translator] => 
    [is_translation_enabled] => 
    [profile_background_color] => C0DEED
    [profile_background_image_url] => http://abs.twimg.com/images/themes/theme1/bg.png
    [profile_background_image_url_https] => https://abs.twimg.com/images/themes/theme1/bg.png
    [profile_background_tile] => 
    [profile_image_url] => http://pbs.twimg.com/profile_images/612999068701335552/VIbF69MX_normal.jpg
    [profile_image_url_https] => https://pbs.twimg.com/profile_images/612999068701335552/VIbF69MX_normal.jpg
    [profile_link_color] => 0084B4
    [profile_sidebar_border_color] => C0DEED
    [profile_sidebar_fill_color] => DDEEF6
    [profile_text_color] => 333333
    [profile_use_background_image] => 1
    [has_extended_profile] => 
    [default_profile] => 1
    [default_profile_image] => 
    [following] => 
    [follow_request_sent] => 
    [notifications] => 
)
my database is as follow




Code:
foreach ($content as $value) {


require('connect.php');


$statement= $db->prepare('INSERT INTO users(email,username,background_pic,pic)
                          values
              (:email,:username,:background_pic,:pic)');

$statement->execute(array( 
':email' => $value['email'],
':username' =>$value['name],
':background_pic' =>$value['profile_background_image_url_https'],
':pic' =>$value['profile_image_url'],
));

}