Re: Can a class instance a property of another class

Ken Kixmoeller -- reply to ken@kixmoeller.com 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? 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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Assigning another class to a class variable is a standard OO technique, so it's not surprising that it's implemented in PHP. I believe it's called "composition", though that term seems to have a wider definition. What is it that seems odd about what you call the getFoo()/getBar() "handshake" ? Actually, what do you mean by that? I could be missing something, but at the moment the two classes and their calls seem pretty straight-forward. -- _____________________ Myron Turner http://www.room535.org http://www.bstatzero.org http://www.mturner.org/XML_PullParser/