public function f5()
{
$this->o2 = new stdClass();
return $this->o2;
}
public function &f6()
{
return $this->a1;
}
public function f7(&$x)
{
$x = 2;
}
}
$foo = new foo();
$foo->f1()[0] = 1;
var_dump($foo->a1);
$foo->f2()[0] = 1;
var_dump($foo->a2);
$foo->f3()[0] = 1;
var_dump($foo->a3);
$foo->f4()->a = 1;
var_dump($foo->o1);
$foo->f5()->a = 1;
var_dump($foo->o2);
$foo->a1[0] = 1;
$foo->f7($foo->f6()[0]);
var_dump($foo->a1[0]);
$foo->f1()[0]++;
var_dump($foo->a1[0]);
$foo->f6()[0]++;
