我使用“get_uploaded_header_images（）”函数获取了数组。现在我想在另一个数组中打印所有的thumbnail_url图像。
我得到的数组是
Array
(
[cropped-abstract-white-awesome-album-black-colorful-cool-music-nice-1064669.jpg] => Array
(
[attachment_id] => 23
[url] => http://localhost/TantraProjects/gradualis/wp-content/uploads/2014/02/cropped-abstract-white-awesome-album-black-colorful-cool-music-nice-1064669.jpg
[thumbnail_url] => http://localhost/TantraProjects/gradualis/wp-content/uploads/2014/02/cropped-abstract-white-awesome-album-black-colorful-cool-music-nice-1064669.jpg
[width] => 1300
[height] => 400
)
[cropped-color.jpg] => Array
(
[attachment_id] => 24
[url] => http://localhost/TantraProjects/gradualis/wp-content/uploads/2014/02/cropped-color.jpg
[thumbnail_url] => http://localhost/TantraProjects/gradualis/wp-content/uploads/2014/02/cropped-color.jpg
[width] => 1300
[height] => 400
)
)
现在我想要所有[thumbnail_url]的数组。