php man page for eio_seek

EIO_SEEK(3)								 1							       EIO_SEEK(3)

eio_seek - Repositions the offset of the open file associated with the$fdargument to the argument$offsetaccording to the directive$whence

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

DESCRIPTION
       eio_seek(3) repositions the offset of the open file associated with stream, Socket resource, or file descriptor specified  by  $fd  to  the
       argument $offset according to the directive $whence as follows:

	      o EIO_SEEK_SET - Set position equal to $offset bytes.

	      o EIO_SEEK_CUR - Set position to current location plus $offset.

	      o EIO_SEEK_END - Set position to end-of-file plus $offset.

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

	      o $offset
		- Starting point from which data is to be read.

	      o $length
		- Number of bytes to be read.

	      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_seek(3) returns request resource on success or FALSE on error.

PHP Documentation Group 													       EIO_SEEK(3)