[1] : select tid from user_post where pid='636775' limit 1 

Array
(
    [tid] => 636776
)
Array
(
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    [2] => https://www.nownews.com/wp-content/uploads/2019/05/1557833743-b896d6fe802f5e498cac0926e4625691-1024x576.jpg
    [3] => https://www.nownews.com/wp-content/uploads/2019/05/1557833738-3b64a2b366ecadc37657125ad927c2c5-1024x576.jpg
    [4] => https://www.nownews.com/wp-content/uploads/2019/05/1557833729-9532f48593f7c8cbd8a32f577b11e3cb-1024x576.jpg
    [5] => https://www.nownews.com/wp-content/uploads/2019/05/1557833724-a742821262a569d3098195a381a3cf17-1024x576.jpg
)
[2] : stage2
[3] : stage3
[4] : http://play.nownews.com/wp-content/uploads/2019/05/1557833753-a5a72e618037db76b178ba9d33942203.jpg
Return
(1 : 6)
[5] : https://www.nownews.com/wp-content/uploads/2019/05/1557833748-e104130fe8535d7f313bc8aa584d8be3-1024x576.jpg
(2 : 6)
[6] : https://www.nownews.com/wp-content/uploads/2019/05/1557833743-b896d6fe802f5e498cac0926e4625691-1024x576.jpg
(3 : 6)
[7] : https://www.nownews.com/wp-content/uploads/2019/05/1557833738-3b64a2b366ecadc37657125ad927c2c5-1024x576.jpg
(4 : 6)
[8] : https://www.nownews.com/wp-content/uploads/2019/05/1557833729-9532f48593f7c8cbd8a32f577b11e3cb-1024x576.jpg
(5 : 6)
[9] : https://www.nownews.com/wp-content/uploads/2019/05/1557833724-a742821262a569d3098195a381a3cf17-1024x576.jpg
(6 : 6)
ReturnStart Cap