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(PHP 5 >= 5.3.0)
stream_supports_lock — Tells whether the stream supports locking.
$stream 
   )Tells whether the stream supports locking through flock() .
stream The stream to check.
   成功时返回  TRUE , 或者在失败时返回  FALSE 。
  
[#1] romain dot ardiet at gmail dot com [2014-10-23 20:54:59]
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
[#2] derkontrollfreak+9hy5l at gmail dot com [2014-08-24 21:09:20]
stream_supports_lock() always returns TRUE on custom wrappers.