How to realize optimistic Lock with php+redis

This article introduces the relevant knowledge of "how to use php+redis to achieve optimistic locks". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

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$redis = new redis ()

$result = $redis- > connect ('127.0.0.1, 6379)

$mywatchkey = $redis- > get ("")

$rob_total = 10

/ / snapped up quantity

If ($mywatchkeywatch ("mywatchkey")

$redis- > multi ()

/ / set delay to facilitate testing effect.

Sleep (5)

/ / insert panic buying data

$redis- > hSet ("mywatchlist", "user_id_" .mt _ rand (1, 9999), time ())

$redis- > set ("mywatchkey", $mywatchkey+1)

$rob_result = $redis- > exec ()

If ($rob_result) {

$mywatchlist = $redis- > hGetAll ("mywatchlist")

Echo "snap up success!"

Echo "remaining quantity:" ($rob_total-$mywatchkey-1). ""

Echo "user list:"

Var_dump ($mywatchlist)

} else {

Echo "if you are unlucky, buy it again!"

Exit

}

}

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