php man page for eio_fsync

EIO_FSYNC(3)								 1							      EIO_FSYNC(3)

eio_fsync - Synchronize a file's in-core state with storage device

SYNOPSIS
       resource eio_fsync (mixed  $fd, [int  $pri = EIO_PRI_DEFAULT], [callable  $callback = NULL], [mixed  $data = NULL])

DESCRIPTION
	Synchronize a file's in-core state with storage device

PARAMETERS
	      o $fd
		- Stream, Socket resource, or numeric file descriptor.

	      o $pri
		-The  request  priority:  EIO_PRI_DEFAULT,  EIO_PRI_MIN,  EIO_PRI_MAX,	or  NULL.  If  NULL  passed,  $pri  internally	is  set to
		EIO_PRI_DEFAULT.

	      o $callback
		-$callback function is called when the request is done. It should match the following prototype:

	      void callback(mixed $data, int $result[, resource $req]);

		     o $data
		       -is custom data passed to the request.

		     o $result
		       -request-specific result value; basically, the value returned by corresponding system call.

		     o $req
		       -is optional request resource which can be used with functions like eio_get_last_error(3)

	      o $data
		- Arbitrary variable passed to $callback.

RETURN VALUES
       eio_fsync(3) returns request resource on success or FALSE on error.

SEE ALSO eio_sync.
PHP Documentation Group 													      EIO_FSYNC(3)