php man page for eio_readahead

EIO_READAHEAD(3)							 1							  EIO_READAHEAD(3)

eio_readahead - Perform file readahead into page cache

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

DESCRIPTION
       eio_readahead(3) populates the page cache with data from a file so that subsequent reads from that file will not block  on  disk  I/O.  See
       READAHEAD(2) man page for details.

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

PHP Documentation Group 													  EIO_READAHEAD(3)