streamWrapper::stream_lock

(PHP 5, PHP 7, PHP 8)

streamWrapper::stream_lock — Advisory file locking

Beschreibung

public streamWrapper::stream_lock(int $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).

It is also possible to have LOCK_NB added as a bitmask to one of the above operations, if the lock should not block during the locking attempt (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