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Is there a way to make functions in PHP synchronized to make sure that two or more webusers can't execute the same function at the same time?
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Threaded::synchronized() function can execute the block while retaining a referenced objects synchronization lock for the calling context. Threaded:: synchronized() function can return a value from the block.
Synchronized methods enable a simple strategy for preventing thread interference and memory consistency errors: if an object is visible to more than one thread, all reads or writes to that object's variables are done through synchronized methods.
There are two types of synchronization: full and incremental.
Data synchronization ensures accurate, secure, compliant data and successful team and customer experiences. It assures congruence between each source of data and its different endpoints. As data comes in, it is cleaned, checked for errors, duplication, and consistency before being put to use.
I think you might achieve the same(if available) by using sem_acquire to acquire a semaphore (entering crital section) and sem_release to release the lock.
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You can use external locking - for example, file locking via flock. Create a file somewhere and have script lock it. You can also use semaphores, but those are Unix only.
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