Ken Kixmoeller -- reply to ken@xxxxxxxxxxxxxx wrote:
> OK, Jochem, I adapted your example and got it working. Thank you very much.
>
> I am still playing with it to better understand. One thing I don't yet
> understand is the necessity for the getFoo()/getBar() "handshake,"
> especially the getbar() in the BAR class. That doesn't seem to serve any
> purpose. My adaptation us just a getDummy().
>
> Do they just serve to pass the object by reference?
no - the whole piece of code was just a silly example to show you
that you can stuff an object into the property of another object.
objects are always by reference in php5 - in php4 you have to
use the 'reference' operator (the @ symbol) to make object be passed by reference.
your original question showed a new object being made in the constructor
of another object - that is fine but it seems a little pointless to
worry about referencing some 'global' [connection] object in each relevant
class when you seem to be creating a new object in each constructor.
try this example (I assume you use php5 - which I think you are because
you mentioned using the __construct() method which is a php5 only bit of
functionality):
<?php
class DBConn {
private $userCnt = 0;
function incrementUC() { $this->userCnt++; }
function getUC() { return $this->userCnt; }
}
class DOExample {
private $dbconn;
function __construct() {
$this->dbconn = getDBConn();
$this->dbconn->incrementUC();
}
}
function getDBConn() {
static $conn;
if (!isset($conn))
$conn = new DBConn();
return $conn;
}
$a = new DOExample;
$c = new DOExample;
$b = new DOExample;
$d = getDBConn();
echo $d->getUC(),"\n";
?>
>
>
> Ken
>
> --------------------------------------------------------------
> On Jan 26, 2007, at 5:47 PM, Jochem Maas wrote:
>
>
>>
>> class Foo
>> {
>> private $var;
>> function __construct() { $this->var = "foo"; }
>> function getFoo() { return $this->var; }
>> }
>>
>> class Bar
>> {
>> private $var;
>> private $foo;
>> function __construct() { $this->var = "bar"; $this->foo = new Foo; }
>> function getBar() { return $this->var; }
>> function speak() { echo "I am
>> ",$this->foo->getFoo(),$this->getBar(),"\n"; }
>> }
>>
>>
>
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