streamWrapper::stream_lock()

(PHP 5, PHP 7)

Advisory file locking

说明

publicstreamWrapper::stream_lock(int $operation): bool

This method is called in response toflock(),whenfile_put_contents()(when$flagscontainsLOCK_EX),stream_set_blocking()and when closing the stream (LOCK_UN).

参数

$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 wantflock()to block while locking.(not supported on Windows)

返回值

成功时返回TRUE，或者在失败时返回FALSE。

错误／异常

EmitsE_WARNINGif call to this method fails (i.e. not implemented).

参见

• stream_set_blocking() 为资源流设置阻塞或者阻塞模式
• flock() 轻便的咨询文件锁定