[PHP] oop in reference

<?php
class Ref {
	
	protected $a, $t;
	
	public function __construct() {
		$this->a = "Ref nespremenjen";
		$this->t = new RefS();			// extendan razred
		$this->t->setA($a);				// ki mu podam neko spremenljivko
	}
	
	public function getA() {
		return $this->a;
	}
	
	// za uporabo v extendanem classu
	protected function setA(&$a) {
		$this->a = $a;   // ali "$this->a =& $a;", brez razlike
	}
	
	// za uporabo v extendanem classu
	public function changeA() {
		$this->t->addA(" z dodatkom");
	}
	
}

?>

<?php
class RefS extends Ref {
	public function __construct() {}
	
	public function addA($add) {
		$this->a = $this->a . $add;
	}
	
}
?>

<?php
include_once "class.Ref.php";
include_once "class.RefS.php";

$t = new Ref();

echo $t->getA() . "<br />";

$t->changeA();

echo $t->getA() . "<br />";
?>

var_dump($t)

object(Ref)#1 (2) {
  ["a"]=>
  string(16) "Ref nespremenjen"
  ["t"]=>
  object(RefS)#2 (2) {
    ["a"]=>
    string(11) " z dodatkom"
    ["t"]=>
    NULL
  }
}

MrBrdo je 1. mar 2012 ob 21:44 izjavil:

Mimogrede, ni najlepsa praska, da v osnovnem razredu definiras metodo, ki klice metodo, ki jo definira podrazred.