[1] : select tid from user_post where pid='637278' limit 1 

Array
(
    [tid] => 637279
)
Array
(
    [0] => http://play.nownews.com/wp-content/uploads/2019/05/1558003061-4862f89d7e4e40188ffbd6737668f130.jpg
    [1] => https://www.nownews.com/wp-content/uploads/2019/05/1558003189-89fdf07674716b884cc704ce7c6850b7.jpg
    [2] => https://www.nownews.com/wp-content/uploads/2019/05/1558003257-c8f72a1d8e6e00c6e09abd491bed05ae.jpg
    [3] => https://www.nownews.com/wp-content/uploads/2019/05/1558003339-baa9c122f3ca77e8b3f9a0a8eebd069a.jpg
)
[2] : stage2
[3] : stage3
[4] : http://play.nownews.com/wp-content/uploads/2019/05/1558003061-4862f89d7e4e40188ffbd6737668f130.jpg
Return
(1 : 4)
[5] : https://www.nownews.com/wp-content/uploads/2019/05/1558003189-89fdf07674716b884cc704ce7c6850b7.jpg
(2 : 4)
[6] : https://www.nownews.com/wp-content/uploads/2019/05/1558003257-c8f72a1d8e6e00c6e09abd491bed05ae.jpg
(3 : 4)
[7] : https://www.nownews.com/wp-content/uploads/2019/05/1558003339-baa9c122f3ca77e8b3f9a0a8eebd069a.jpg
(4 : 4)
ReturnStart Cap