Stream 函数
PHP Manual

stream_supports_lock

(PHP 5 >= 5.3.0, PHP 7)

stream_supports_lockTells whether the stream supports locking

说明

bool stream_supports_lock ( resource $stream )

Tells whether the stream supports locking through flock().

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


Stream 函数
PHP Manual