[1] : select tid from user_post where pid='639930' limit 1 

Array
(
    [tid] => 639931
)
Array
(
    [0] => http://www.orientalsunday.hk/wp-content/uploads/2016/02/img_20160215_021557.jpg
    [1] => http://www.orientalsunday.hk/wp-content/uploads/2016/02/img_20160215_021632-1024x1024.jpg
    [2] => http://www.orientalsunday.hk/wp-content/uploads/2016/02/img_20160215_021606-1024x1024.jpg
)
[2] : stage2
[3] : stage3
[4] : http://www.orientalsunday.hk/wp-content/uploads/2016/02/img_20160215_021557.jpg
Return
(1 : 3)
[5] : http://www.orientalsunday.hk/wp-content/uploads/2016/02/img_20160215_021632-1024x1024.jpg
(2 : 3)
[6] : http://www.orientalsunday.hk/wp-content/uploads/2016/02/img_20160215_021606-1024x1024.jpg
(3 : 3)
ReturnStart Cap