/** * Advisory file locking. * * This method is called in response to flock(), when file_put_contents() * (when flags contains LOCK_EX), stream_set_blocking() and when closing the * stream (LOCK_UN). * * $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. * * @param integer $operation One of the LOCK_* constants * @return boolean TRUE on success or FALSE on failure. */ public function stream_lock($operation) { if ($operation === LOCK_UN) { return $this->streamWrapper->unlock(); } else { return $this->streamWrapper->lock($operation); } }