[1] : select tid from user_post where pid='599796' limit 1 

Array
(
    [tid] => 599797
)
Array
(
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    [1] => https://www.nownews.com/wp-content/uploads/2019/01/1546666439-ae84cf2a4db7f62f0478783f8025d858.jpg
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    [3] => https://www.nownews.com/wp-content/uploads/2019/01/1546666546-5745d0cf0f28f373b4550c293f7c2658.jpg
    [4] => https://www.nownews.com/wp-content/uploads/2019/01/1546967862-966aad9f2bbb8769be3d9e8333c6a64e.jpg
    [5] => https://www.nownews.com/wp-content/uploads/2019/01/1546967892-d24e16633f71429a2d830e4d0754cfac.jpg
    [6] => https://www.nownews.com/wp-content/uploads/2019/01/1546967799-0d08b145fe0d330395e5c906bb290f69.jpg
    [7] => https://www.nownews.com/wp-content/uploads/2019/01/1546967838-6de418b2a8a5c0353694434490980da3.jpg
)
[2] : stage2
[3] : stage3
[4] : https://www.nownews.com/wp-content/uploads/2019/01/1546664648-00c46018ff7501b3c36fbdcef53b034d.jpg
Return
(1 : 8)
[5] : https://www.nownews.com/wp-content/uploads/2019/01/1546666439-ae84cf2a4db7f62f0478783f8025d858.jpg
(2 : 8)
[6] : https://www.nownews.com/wp-content/uploads/2019/01/1546666479-84766340402c11c56ad30077cef1c4c8.jpg
(3 : 8)
[7] : https://www.nownews.com/wp-content/uploads/2019/01/1546666546-5745d0cf0f28f373b4550c293f7c2658.jpg
(4 : 8)
[8] : https://www.nownews.com/wp-content/uploads/2019/01/1546967862-966aad9f2bbb8769be3d9e8333c6a64e.jpg
(5 : 8)
[9] : https://www.nownews.com/wp-content/uploads/2019/01/1546967892-d24e16633f71429a2d830e4d0754cfac.jpg
(6 : 8)
[10] : https://www.nownews.com/wp-content/uploads/2019/01/1546967799-0d08b145fe0d330395e5c906bb290f69.jpg
(7 : 8)
[11] : https://www.nownews.com/wp-content/uploads/2019/01/1546967838-6de418b2a8a5c0353694434490980da3.jpg
(8 : 8)
ReturnStart Cap