[1] : select tid from user_post where pid='613860' limit 1 

Array
(
    [tid] => 613861
)
Array
(
    [0] => https://imgs.plastichubdaily.com/wp-content/uploads/2018/06/goruog_11274994475b111a470a08d.jpg
    [1] => https://imgs.plastichubdaily.com/wp-content/uploads/2018/06/20180601_pl_teacher01_15822988535b11182d53b2c.jpg
    [2] => https://imgs.plastichubdaily.com/wp-content/uploads/2018/06/20180601_pl_teacher03_15340753295b111837c7dd4.jpg
    [3] => https://imgs.plastichubdaily.com/wp-content/uploads/2018/06/20180601_pl_teacher04_15972582555b1118441a7ba.jpg
)
[2] : stage2
[3] : stage3
[4] : https://imgs.plastichubdaily.com/wp-content/uploads/2018/06/goruog_11274994475b111a470a08d.jpg
Return
(1 : 4)
[5] : https://imgs.plastichubdaily.com/wp-content/uploads/2018/06/20180601_pl_teacher01_15822988535b11182d53b2c.jpg
(2 : 4)
[6] : https://imgs.plastichubdaily.com/wp-content/uploads/2018/06/20180601_pl_teacher03_15340753295b111837c7dd4.jpg
(3 : 4)
[7] : https://imgs.plastichubdaily.com/wp-content/uploads/2018/06/20180601_pl_teacher04_15972582555b1118441a7ba.jpg
(4 : 4)
ReturnStart Cap