PHP Classes Extend

Question

I have two classes that work seperate from another, but they extend the same class. Is it possible to have them work the same instance of the extended class. I'm wanting the constructor of the extended class to run only once.

I know this isn't right but something like this:

<?php
$oApp = new app;
class a extends $oApp {}
class b extends $oApp {}

Answer 1

Ah, in that case I believe you would want to pass the class in as a parameter for the other two classes:

/**
 * 
 */
class abParent{
    /**
     * @var app
     */
    protected $app;
    /**
     *
     * @param app $app
     */
    public function __construct(app &$app){
        $this->app = &$app;
    }
}

class a extends abParent{}
class b extends abParent{}


$app = new app();
$a = new a($app);
$b = new b($app);

var_dump($a, $b);

Answer 2

What you want is this:

<?php
$oApp = new app;
class a extends app{}
class b extends app{}

If you have __constructors in the child classes, make sure that they call parent::__constructor, otherwise they will probably not work properly.