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class b
{
function add (a $a,a $c)
{
return ($a->n+$c->n);
}
}
class a
{
public $n;
function __construct($n)
{
$this->n = $n;
}
}
$obj = new b();
$a = new a(1);
$c = new a(2);
$d = $obj->add($a,$c);
echo $d;