массивы — PHP array_multisort не работает правильно

Я пытался использовать array_multisort (), но он не работает правильно.

У меня установлено 2 массива:

$sortArr = array(); // array used for sorting by price
$optionsArray = array();

Затем я хочу отсортировать массив $ optionsArray, используя цену:

array_multisort($sortArr, SORT_DESC, $optionsArray);

Проблема в том, что порядок результатов меняется, но не правильно. Пример, который я использовал, на самом деле довольно близок, но другие не близки.

Когда VAR сбрасывает массивы ПОСЛЕ использования array_multisort, я получаю:

($ SortArr):

 array(8) {
[0]=> object(SimpleXMLElement)#61 (1) { [0]=> string(3) "610" }
[1]=> object(SimpleXMLElement)#66 (1) { [0]=> string(3) "300" }
[2]=> object(SimpleXMLElement)#71 (1) { [0]=> string(3) "235" }
[3]=> object(SimpleXMLElement)#56 (1) { [0]=> string(1) "0" }
[4]=> object(SimpleXMLElement)#51 (1) { [0]=> string(3) "135" }
[5]=> object(SimpleXMLElement)#41 (1) { [0]=> string(1) "0" }
[6]=> object(SimpleXMLElement)#46 (1) { [0]=> string(1) "0" }
[7]=> object(SimpleXMLElement)#36 (1) { [0]=> string(1) "0" }
}

($ OptionsArray):

 array(8) {
[0]=> array(4) {
["shortdesc"]=> object(SimpleXMLElement)#60 (1) { 0]=> string(14) "Metallic paint" }
["longdesc"]=> object(SimpleXMLElement)#54 (1) { [0]=> string(14) "Metallic paint" }
["price"]=> object(SimpleXMLElement)#61 (1) { [0]=> string(3) "610" }
["kind"]=> object(SimpleXMLElement)#62 (1) { [0]=> string(8) "Optional" } }
[1]=> array(4) {
["shortdesc"]=> object(SimpleXMLElement)#65 (1) { [0]=> string(43) "Seat heating for driver and front passenger" }
["longdesc"]=> object(SimpleXMLElement)#59 (1) { [0]=> string(33) "Driver and passenger seat: heated" }
["price"]=> object(SimpleXMLElement)#66 (1) { [0]=> string(3) "300" }
["kind"]=> object(SimpleXMLElement)#67 (1) { [0]=> string(8) "Optional" } }
[2]=> array(4) {
["shortdesc"]=> object(SimpleXMLElement)#70 (1) { [0]=> string(20) "Sun protection glass" }
["longdesc"]=> object(SimpleXMLElement)#64 (1) { [0]=> string(61) "Privacy glass on the rear window and on the rear side windows" }
["price"]=> object(SimpleXMLElement)#71 (1) { [0]=> string(3) "235" }
["kind"]=> object(SimpleXMLElement)#72 (1) { [0]=> string(8) "Optional" } }
[3]=> array(4) {
["shortdesc"]=> object(SimpleXMLElement)#55 (1) { [0]=> string(23) "Glacier Silver metallic" }
["longdesc"]=> object(SimpleXMLElement)#49 (1) { [0]=> string(23) "External colour: silver" }
["price"]=> object(SimpleXMLElement)#56 (1) { [0]=> string(1) "0" }
["kind"]=> object(SimpleXMLElement)#57 (1) { [0]=> string(8) "Optional" } }
[4]=> array(4) {
["shortdesc"]=> object(SimpleXMLElement)#50 (1) { [0]=> string(16) "Extended storage" }
["longdesc"]=> object(SimpleXMLElement)#44 (1) { [0]=> string(243) "2 x 12v power outlet located in rear section, Seat back storage: pockets behind front seats, Versatile net, Storage net on left in luggage compartment, Two extra lashing eyes in luggage compartment, Retaining strap on right luggage compartment" }
["price"]=> object(SimpleXMLElement)#51 (1) { [0]=> string(3) "135" }
["kind"]=> object(SimpleXMLElement)#52 (1) { [0]=> string(8) "Optional" } }
[5]=> array(4) {
["shortdesc"]=> object(SimpleXMLElement)#40 (1) { [0]=> string(31) "Brushed Aluminium interior trim" }
["longdesc"]=> object(SimpleXMLElement)#29 (1) { [0]=> string(109) "Alloy look trim on dashboard, alloy look trim on doors and alloy look trim on centre console, Alloy dashboard" }
["price"]=> object(SimpleXMLElement)#41 (1) { [0]=> string(1) "0" }
["kind"]=> object(SimpleXMLElement)#42 (1) { [0]=> string(8) "Optional" } }
[6]=> array(4) {
["shortdesc"]=> object(SimpleXMLElement)#45 (1) { [0]=> string(22) "Dakota Leather - Black" }
["longdesc"]=> object(SimpleXMLElement)#39 (1) { [0]=> string(61) "Leather and leather seat upholstery, Upholstery colour: black" }
["price"]=> object(SimpleXMLElement)#46 (1) { [0]=> string(1) "0" }
["kind"]=> object(SimpleXMLElement)#47 (1) { [0]=> string(8) "Optional" } }
[7]=> array(4) {
["shortdesc"]=> object(SimpleXMLElement)#35 (1) { [0]=> string(17) "Brushed Aluminium" }
["longdesc"]=> object(SimpleXMLElement)#34 (1) { [0]=> string(77) "Alloy trim on dashboard, alloy trim on doors and alloy trim on centre console" }
["price"]=> object(SimpleXMLElement)#36 (1) { [0]=> string(1) "0" }
["kind"]=> object(SimpleXMLElement)#37 (1) { [0]=> string(8) "Optional" } }
}

Массивы создаются с использованием этого:

foreach ($options as $key => $option) { // create the array for the options
if ($option->OptionKind != 'Standard') {
$longDesc = $option->LongDescription;
$shortDesc = $option->ShortDescription;
$optionPrice = $option->Price;
$optionType = $option->OptionKind;
$optionsArray[] = array('shortdesc' => $shortDesc, 'longdesc' => $longDesc, 'price' => $optionPrice, 'kind' => $optionType);
$sortArr[] = $optionPrice;
}
}

Любые идеи, где я иду не так?