stream_supports_lock()

(PHP 5 >= 5.3.0, PHP 7)

Tells whether the stream supports locking

说明

stream_supports_lock(resource $stream): bool

Tells whether the stream supports locking throughflock().

参数

$stream

The stream to check.

返回值

成功时返回TRUE，或者在失败时返回FALSE。

参见

• flock() 轻便的咨询文件锁定

This method returns TRUE on custom wrappers by default if you don't implement the stream_lock() method inside the wrapper : http://php.net/manual/en/streamwrapper.stream-lock.php