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PHP Semaphores

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im fairly new to php and i am trying to design a website for holiday accommodation.
therefore i need to solve the concurrent user problem to ensure that two users cannot book the same accommodation for the same time.
i have been trying to understand how the semaphores work in php so i can use it to solve the problem but it dont actually understand it.
can anyone actually explain how i could use them or how they work plz?

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I think your barking up the wrong tree there. Much better to do this at a database level using transactions.

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