(PECL sync >= 1.0.0)
SyncSemaphore::unlock — Increases the count of the semaphore
public SyncSemaphore::unlock ([ int &$prevcount ] ) : bool
Increases the count of a SyncSemaphore object.
prevcount
Returns the previous count of the semaphore.
A boolean of TRUE if the unlock operation was successful, FALSE otherwise.
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https://www.php.net/manual/en/syncsemaphore.unlock.php