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(PHP 5)
streamWrapper::stream_lock — Advisory file locking
$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
).
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)
成功时返回 TRUE
, 或者在失败时返回 FALSE
。
Emits E_WARNING
if call to this method fails (i.e. not implemented).