PHP：SOAP响应排序结果

Question

I'm trying to sort the results by ROOMPRICE of a soap response :

stdClass Object ( 
    [GetHotelsResult] => stdClass Object ( 
        [SEARCH_RESPONSE] => Array ( 
            [0] => stdClass Object ( 
                [HOTELNAME] => Hotel1 
                [ROOMNAME] => Room2 
                [ROOMPRICE] => 144.50 
            ) 
            [1] => stdClass Object ( 
                [HOTELNAME] => Hotel1 
                [ROOMNAME] => Room1 
                [ROOMPRICE] => 231.10 
            ) 
            [2] => stdClass Object ( 
                [HOTELNAME] => Hotel1 
                [ROOMNAME] => Room3 
                [ROOMPRICE] => 94.00 
            ) 
        ) 
    ) 
);

I've made many solutions, but they didn't work...

MY ACTUAL CODE:

$sClient = new SoapClient($wsdl, array('trace' => 1));
$response = $sClient->GetHotels($data);     
$ghdata = $sClient->__getLastResponse();
$doc = new DOMDocument();
$doc->loadXML($ghdata); 
$x = $doc->documentElement;
$rooms = $x->getElementsByTagName( "SEARCH_RESPONSE" );
    foreach( $rooms as $SEARCH_RESPONSE )
{ // show results

Answer 1

Assuming $response is your outer stdClass object, I guess you're getting and error like that:

Warning: usort() expects parameter 1 to be array, object given in ...

This is because usort works with array and not objects. What you actually want to sort is a SEARCH_RESPONSE array. Also, pay attention that elements in this array are stdClass objects themselves, so you have to use $a->{$key} notation instead of [] :

function build_sorter($key) {
    return function ($a, $b) use ($key) {
        // pay attention to `{$key}` notation
        return strnatcmp($a->{$key}, $b->{$key});
   };
}

// Get array to sort
usort($response->GetHotelsResult->SEARCH_RESPONSE, build_sorter('ROOMPRICE'));

foreach ($response->GetHotelsResult->SEARCH_RESPONSE as $item) {
    echo $item->ROOMNAME . ', ' . $item->ROOMPRICE . "\n";
}