stream_supports_lock

Function name: stream_supports_lock()

Applicable version: PHP 4 >= 4.3.0, PHP 5, PHP 7

Function Description: This function is used to detect whether the specified stream supports file locking.

usage:

bool stream_supports_lock ( resource $stream )

parameter:

• $stream: The stream resource to be detected.

Return value:

Return true if the stream supports file locking; otherwise return false.

Example:

 // 创建一个文件流$stream = fopen('example.txt', 'r'); // 检测流是否支持文件锁定if (stream_supports_lock($stream)) { echo "该流支持文件锁定"; } else { echo "该流不支持文件锁定"; } // 关闭流fclose($stream);

Notes:

• Before calling the stream_supports_lock() function, you need to make sure that a valid stream resource has been opened.
• This function is only suitable for file streams, not network streams or other types of streams.
• Note that even if the stream supports file locking, it is not guaranteed to work properly in all operating systems and environments, because the behavior of file locking depends on the characteristics and limitations of the operating system.