function _GetPropertyValueIndex(&$el, $propertyName)
{
// example: $propertyName = "Image.URL": get $el's property "Image.URL" and return index of value (in DBValues array) linked to it
if (!$propertyName || !$el || empty($el['Properties'])) {
return -1;
}
$property = OEDynUtils::_FindInArray($el['Properties'], $propertyName);
if ($property === null) {
return -1;
}
return intval($property);
// index in DBValues array
}