streamWrapper::stream_lock
(PHP 5, PHP 7)
streamWrapper::stream_lock — Advisory file locking
설명
public bool streamWrapper::stream_lock
( int
$operation
)
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).
인수
-
operation -
operationis one of the following:-
LOCK_SHto acquire a shared lock (reader). -
LOCK_EXto acquire an exclusive lock (writer). -
LOCK_UNto release a lock (shared or exclusive). -
LOCK_NBif you don't want flock() to block while locking. (not supported on Windows)
-
반환값
성공 시 TRUE를, 실패 시 FALSE를 반환합니다.
오류/예외
Emits E_WARNING if call to this method fails (i.e. not implemented).
참고
- stream_set_blocking() - Set blocking/non-blocking mode on a stream
- flock() - Portable advisory file locking
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