stream_supports_lock(3) php man page | unix.com

STREAM_SUPPORTS_LOCK(3) 						 1						   STREAM_SUPPORTS_LOCK(3)

stream_supports_lock - Tells whether the stream supports locking.

SYNOPSIS
       bool stream_supports_lock (resource  $stream)

DESCRIPTION
	Tells whether the stream supports locking through flock(3).

PARAMETERS
	      o $stream
		- The stream to check.

RETURN VALUES
	Returns TRUE on success or FALSE on failure.

SEE ALSO
       flock(3).

PHP Documentation Group 												   STREAM_SUPPORTS_LOCK(3)