streamWrapper::stream_lock
(PHP 5, PHP 7, PHP 8)
streamWrapper::stream_lock — Advisory file locking
Beschreibung
$operation
): bool
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
).
Parameter-Liste
-
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)
-
Rückgabewerte
Gibt bei Erfolg true
zurück. Bei einem Fehler wird false
zurückgegeben.
Fehler/Exceptions
Emits E_WARNING
if call to this method fails (i.e. not implemented).
Siehe auch
- stream_set_blocking() - Set blocking/non-blocking mode on a stream
- flock() - Portables Datei-Sperrverfahren (advisory locking)