= 5.3.0, PHP 7, PHP 8)stream_supports_lock — Tells whether the stream supports locking說(shuō)明stream_supports_lock(resource $str">

stream_supports_lock

(PHP 5 >= 5.3.0, PHP 7, PHP 8)

stream_supports_lock — Tells whether the stream supports locking

stream_supports_lock(resource $stream): bool

Tells whether the stream supports locking through flock().

成功時(shí)返回 true，或者在失敗時(shí)返回 false。