streamWrapper::stream_lock — Advisory file locking
public bool streamWrapper::stream_lock
( mode $operation
operation is one of the following:
LOCK_SH to acquire a shared lock (reader).
LOCK_EX to acquire an exclusive lock (writer).
LOCK_UN to release a lock (shared or exclusive).
LOCK_NB if you don't want
flock() to block while locking.
(not supported on Windows)
Returns TRUE on success or FALSE on failure.
Emits E_WARNING if call to this method fails (i.e. not implemented).