$array = array(5,7,9,3,6,5,4);
$arrayObj = new ArrayObject($array);
var_dump($arrayObj);
$arrayObj2 = new ArrayObject($arrayObj->getArrayCopy(), ArrayObject::STD_PROP_LIST);
var_dump($arrayObj2);

object(ArrayObject)#1 (7) { [0]=> int(5) [1]=> int(7) [2]=> int(9) [3]=> int(3) [4]=> int(6) [5]=> int(5) [6]=> int(4) }
    object(ArrayObject)#2 (0) { }

object(ArrayObject)#1 (1) { ["storage":"ArrayObject":private]=> array(7) { [0]=> int(5) [1]=> int(7) [2]=> int(9) [3]=> int(3) [4]=> int(6) [5]=> int(5) [6]=> int(4) } }
    object(ArrayObject)#2 (1) { ["storage":"ArrayObject":private]=> array(7) { [0]=> int(5) [1]=> int(7) [2]=> int(9) [3]=> int(3) [4]=> int(6) [5]=> int(5) [6]=> int(4) } }