[int$max_acquire = 1],
[int$permissions = 0666],
[bool$auto_release = true]
sem_get returns an id that can be used to access the System V semaphore with the given key.
A second call to sem_get for the same key will return a different semaphore identifier, but both identifiers access the same underlying semaphore.
If key is 0, a new private semaphore is created for each call to sem_get.
The number of processes that can acquire the semaphore simultaneously is set to max_acquire.
The semaphore permissions. Actually this value is set only if the process finds it is the only process currently attached to the semaphore.
Specifies if the semaphore should be automatically released on request shutdown.
Returns a positive semaphore identifier on success, or false on error.
When using sem_get to access a semaphore created outside PHP, note that the semaphore must have been created as a set of 3 semaphores (for example, by specifying 3 as the nsems parameter when calling the C semget() function), otherwise PHP will be unable to access the semaphore.
|8.0.0||On success, this function returns a SysvSemaphore instance now; previously, a resource was returned.|
|8.0.0||The type of auto_release has been changed from int to bool.|