Re: [PHP] Beginner Tutorials for using CLASSES in PHP4

On Wed, 2007-10-10 at 14:44 +0100, Tony Marston wrote:
""Nathan Nobbe"" <quickshiftin@xxxxxxxxx> wrote in message
news:7dd2dc0b0710091950i62159761le400b3839677bebd@xxxxxxxxxxxxxxxxx
On 10/9/07, Robert Cummings <robert@xxxxxxxxxxxxx> wrote:

On Tue, 2007-10-09 at 21:37 -0400, Nathan Nobbe wrote:

does a lawn mower not have blades; and gas and a control panel; does it
not
have
wheels? my object modeling of a lawn mower would certainly have these
things;
and most likely i would mark components of the engine as private.
and what does a lawn mower cut anyway; grass; i thought that was it.
so
if
there
was no grass could there still be an algorithm to cut it?
i say grass is part of the grass-cutting algorithm.

Well it helps to refine the algorithm, but let's say we use fingers
instead as our measure... I'm sure we would find that we could cut grass
also >:)


good point.
the lawn mower is still consistent of its own parts and they
comprise its implementation.

-nathan

Yes, but a lawnmower does not contain grass, it is used to cut grass. Whole
grass goes in and cut grass comes out. The lawnmower does not have any grass
in its construction, therefore grass is not part of the implementation.

It may not be part of it's construction, but it certainly is a member
variable. It's along the lines of the following:

<?php

class Lawnmower
{
var $works = true;
var $grassyMulchCrapStuckToUndersideOfLawnmower = 0;

function mow( $what )
{
if( !$this->works )
{
return false;
}

if( $what == 'grass' )
{
$this->grassyMulchCrapStuckToUndersideOfLawnmower +=
rand( 1, 100 );

if( $this->grassyMulchCrapStuckToUndersideOfLawnmower >
1000 )
{
return $this->seize();
}
}
else
if( $what == 'fingers' )
{
// >:)
}

return true;
}

function seize()
{
return ($this->works = false);
}
}

?>

Cheers,
Rob.
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