使用PHP -循环从EAN API读取响应JSON - Read response JSON from EAN API with PHP - Loop

我正在尝试构建一个应用程序，通过从Expidia API的响应JSON搜索。

当我使用这个方法时，它工作得很好:

<form name="search_form" action="<?php echo $_SERVER['PHP_SELF']; ?>" method="POST">
<label><span class="label">Town:</span>
<input type="text" id="search_town" name="search_town"></label>
<br><br><input class="Send" type="submit" name="search" value="Search">
</form>
<?php
if(isset($_POST['search']))
{
    SearchTown();
}
function SearchTown()
{
$search_town = $_POST['search_town'];
$no_requests = "1";
$url    = "http://dev.api.ean.com/ean-services/rs/hotel/v3/list?cid=55505&apiKey=r662e63dr8tkvh9ttqjmsev8&locale=en_US&currencyCode=USD&xml=%3CHotelListRequest%3E%3Ccity%3E".$search_town."%3C/city%3E%3CarrivalDate%3E08/01/2014%3C/arrivalDate%3E%3CdepartureDate%3E08/03/2014%3C/departureDate%3E%3CRoomGroup%3E%3CRoom%3E%3CnumberOfAdults%3E2%3C/numberOfAdults%3E%3C/Room%3E%3C/RoomGroup%3E%3CnumberOfResults%3E".$no_requests."%3C/numberOfResults%3E%3CsupplierCacheTolerance%3EMED_ENHANCED%3C/supplierCacheTolerance%3E%3C/HotelListRequest%3E";
$result = file_get_contents($url);

$data = json_decode($result);
    print_r($data->HotelListResponse->HotelList->HotelSummary->name);
}
?>

它给出了我输入的城市旅馆。所以这很好

在URL请求中，我只是搜索了1个回复，但显然我想要返回几个酒店。

我试过了:

<form name="search_form" action="<?php echo $_SERVER['PHP_SELF']; ?>" method="POST">
<label><span class="label">Town:</span>
<input type="text" id="search_town" name="search_town"></label>
<br><br><input class="Send" type="submit" name="search" value="Search">
</form>
<?php
if(isset($_POST['search']))
{
    SearchTown();
}
function SearchTown()
{
$search_town = $_POST['search_town'];
$no_requests = "2";
$url    = "http://dev.api.ean.com/ean-services/rs/hotel/v3/list?cid=55505&apiKey=r662e63dr8tkvh9ttqjmsev8&locale=en_US&currencyCode=USD&xml=%3CHotelListRequest%3E%3Ccity%3E".$search_town."%3C/city%3E%3CarrivalDate%3E08/01/2014%3C/arrivalDate%3E%3CdepartureDate%3E08/03/2014%3C/departureDate%3E%3CRoomGroup%3E%3CRoom%3E%3CnumberOfAdults%3E2%3C/numberOfAdults%3E%3C/Room%3E%3C/RoomGroup%3E%3CnumberOfResults%3E".$no_requests."%3C/numberOfResults%3E%3CsupplierCacheTolerance%3EMED_ENHANCED%3C/supplierCacheTolerance%3E%3C/HotelListRequest%3E";
$result = file_get_contents($url);

$data = json_decode($result);
for ($i = 1; $i <= $no_requests; $i++) {
    print_r($data->HotelListResponse->HotelList->HotelSummary->name[$i]);
}
}
?>

它给了我通知:

Notice: Trying to get property of non-object in C:'xampp'htdocs'vhi_test'testing2.php on line 34

我已经尝试了一百万种不同的方法，但似乎只能从回应中得到一个名字。拜托，有人能帮忙吗?非常感谢。

编辑:以下分别是针对单个和多个结果的示例回答。

{"HotelListResponse":{"customerSessionId":"0ABAAAB2-1097-6F91-4712-BDAD2ED90D22","numberOfRoomsRequested":1,"moreResultsAvailable":true,"cacheKey":"-7610976f:1471bdad2ed:-d20","cacheLocation":"10.186.170.178:7300","HotelList":{"@size":"1","@activePropertyCount":"142","HotelSummary":{"@order":"0","hotelId":126952,"name":"Cleveland Marriott Downtown at Key Center","address1":"127 Public Sq","city":"Cleveland","stateProvinceCode":"OH","postalCode":44114,"countryCode":"US","airportCode":"CLE","supplierType":"E","propertyCategory":1,"hotelRating":3.5,"confidenceRating":52,"amenityMask":16818307,"tripAdvisorRating":4.5,"locationDescription":"Near Quicken Loans Arena","shortDescription":"<p><b>Property Location<''/b> <br ''/>With a stay at Cleveland Marriott Downtown at Key Center, you'll be centrally located in Cleveland, steps from Old Stone Church and Key Tower. This hotel is within","highRate":159,"lowRate":159,"rateCurrencyCode":"USD","latitude":41.50044,"longitude":-81.69424,"proximityDistance":3.4120276,"proximityUnit":"MI","hotelInDestination":true,"thumbNailUrl":"''/hotels''/1000000''/30000''/23200''/23199''/23199_66_t.jpg","deepLink":"http:''/''/travel.ian.com''/index.jsp?pageName=hotAvail&cid=55505&hotelID=126952&mode=2&numberOfRooms=1&room-0-adult-total=2&room-0-child-total=0&arrivalMonth=7&arrivalDay=1&departureMonth=7&departureDay=3&showInfo=true&locale=en_US&currencyCode=USD","RoomRateDetailsList":{"RoomRateDetails":{"roomTypeCode":30940,"rateCode":202960472,"maxRoomOccupancy":4,"quotedRoomOccupancy":2,"minGuestAge":0,"roomDescription":"Deluxe Room - Advance Purchase*","currentAllotment":0,"propertyAvailable":true,"propertyRestricted":false,"expediaPropertyId":23199,"rateKey":"0ABAAAB2-1097-6F91-4712-BDAD2ED90D1F","RateInfo":{"@priceBreakdown":"true","@promo":"false","@rateChange":"false","ChargeableRateInfo":{"@averageBaseRate":"159.0","@averageRate":"159.0","@commissionableUsdTotal":"318.0","@currencyCode":"USD","@maxNightlyRate":"159.0","@nightlyRateTotal":"318.0","@surchargeTotal":"62.1","@total":"380.1","NightlyRatesPerRoom":{"@size":"2","NightlyRate":[{"@baseRate":"159.0","@rate":"159.0","@promo":"false"},{"@baseRate":"159.0","@rate":"159.0","@promo":"false"}]},"Surcharges":{"@size":"1","Surcharge":{"@type":"TaxAndServiceFee","@amount":"62.1"}}}}}}}}}}
{"HotelListResponse":{"customerSessionId":"0ABAAAB0-E70B-AC91-4712-BD8FEE3927B3","numberOfRoomsRequested":1,"moreResultsAvailable":true,"cacheKey":"-5e70bac:1471bd8fee3:27c4","cacheLocation":"10.186.170.176:7300","HotelList":{"@size":"2","@activePropertyCount":"142","HotelSummary":[{"@order":"0","hotelId":126952,"name":"Cleveland Marriott Downtown at Key Center","address1":"127 Public Sq","city":"Cleveland","stateProvinceCode":"OH","postalCode":44114,"countryCode":"US","airportCode":"CLE","supplierType":"E","propertyCategory":1,"hotelRating":3.5,"confidenceRating":52,"amenityMask":16818307,"tripAdvisorRating":4.5,"locationDescription":"Near Quicken Loans Arena","shortDescription":"<p><b>Property Location<''/b> <br ''/>With a stay at Cleveland Marriott Downtown at Key Center, you'll be centrally located in Cleveland, steps from Old Stone Church and Key Tower. This hotel is within","highRate":159,"lowRate":159,"rateCurrencyCode":"USD","latitude":41.50044,"longitude":-81.69424,"proximityDistance":3.4120276,"proximityUnit":"MI","hotelInDestination":true,"thumbNailUrl":"''/hotels''/1000000''/30000''/23200''/23199''/23199_66_t.jpg","deepLink":"http:''/''/travel.ian.com''/index.jsp?pageName=hotAvail&cid=55505&hotelID=126952&mode=2&numberOfRooms=1&room-0-adult-total=2&room-0-child-total=0&arrivalMonth=7&arrivalDay=1&departureMonth=7&departureDay=3&showInfo=true&locale=en_US&currencyCode=USD","RoomRateDetailsList":{"RoomRateDetails":{"roomTypeCode":30940,"rateCode":202960472,"maxRoomOccupancy":4,"quotedRoomOccupancy":2,"minGuestAge":0,"roomDescription":"Deluxe Room - Advance Purchase*","currentAllotment":0,"propertyAvailable":true,"propertyRestricted":false,"expediaPropertyId":23199,"rateKey":"0ABAAAB0-E70B-AC91-4712-BD8FEE3927C5","RateInfo":{"@priceBreakdown":"true","@promo":"false","@rateChange":"false","ChargeableRateInfo":{"@averageBaseRate":"159.0","@averageRate":"159.0","@commissionableUsdTotal":"318.0","@currencyCode":"USD","@maxNightlyRate":"159.0","@nightlyRateTotal":"318.0","@surchargeTotal":"62.1","@total":"380.1","NightlyRatesPerRoom":{"@size":"2","NightlyRate":[{"@baseRate":"159.0","@rate":"159.0","@promo":"false"},{"@baseRate":"159.0","@rate":"159.0","@promo":"false"}]},"Surcharges":{"@size":"1","Surcharge":{"@type":"TaxAndServiceFee","@amount":"62.1"}}}}}}},{"@order":"1","hotelId":163227,"name":"DoubleTree by Hilton Cleveland Downtown - Lakeside","address1":"1111 Lakeside Avenue E","city":"Cleveland","stateProvinceCode":"OH","postalCode":44114,"countryCode":"US","airportCode":"CLE","supplierType":"E","propertyCategory":1,"hotelRating":3.5,"confidenceRating":52,"amenityMask":24617091,"tripAdvisorRating":4,"locationDescription":"Near Rock and Roll Hall of Fame","shortDescription":"<p><b>Property Location<''/b> <br ''/>A stay at DoubleTree by Hilton Cleveland Downtown - Lakeside places you in the heart of Cleveland, walking distance from Cleveland Public Auditorium and Rock and","highRate":179.1,"lowRate":179.1,"rateCurrencyCode":"USD","latitude":41.50642,"longitude":-81.69018,"proximityDistance":3.3392038,"proximityUnit":"MI","hotelInDestination":true,"thumbNailUrl":"''/hotels''/1000000''/20000''/19900''/19876''/19876_113_t.jpg","deepLink":"http:''/''/travel.ian.com''/index.jsp?pageName=hotAvail&cid=55505&hotelID=163227&mode=2&numberOfRooms=1&room-0-adult-total=2&room-0-child-total=0&arrivalMonth=7&arrivalDay=1&departureMonth=7&departureDay=3&showInfo=true&locale=en_US&currencyCode=USD","RoomRateDetailsList":{"RoomRateDetails":{"roomTypeCode":345298,"rateCode":1078896,"maxRoomOccupancy":4,"quotedRoomOccupancy":2,"minGuestAge":0,"roomDescription":"Two Queen Beds Non-Smoking","currentAllotment":0,"propertyAvailable":true,"propertyRestricted":false,"expediaPropertyId":19876,"rateKey":"0ABAAAB0-E70B-AC91-4712-BD8FEE3927C6","RateInfo":{"@priceBreakdown":"true","@promo":"false","@rateChange":"false","ChargeableRateInfo":{"@averageBaseRate":"179.1","@averageRate":"179.1","@commissionableUsdTotal":"358.2","@currencyCode":"USD","@maxNightlyRate":"179.1","@nightlyRateTotal":"358.2","@surchargeTotal":"69.64","@total":"427.84","NightlyRatesPerRoom":{"@size":"2","NightlyRate":[{"@baseRate":"179.1","@rate":"179.1","@promo":"false"},{"@baseRate":"179.1","@rate":"179.1","@promo":"false"}]},"Surcharges":{"@size":"1","Surcharge":{"@type":"TaxAndServiceFee","@amount":"69.64"}}}},"ValueAdds":{"@size":"1","ValueAdd":{"@id":"2048","description":"Free Wireless Internet"}}}}}]}}}

这里的主要问题是您试图访问name属性作为数组而不是HotelSummary。此外，HotelSummary只有在有多个结果时才作为数组返回，否则它是一个对象。这可以通过在循环之前有条件地包装来解决。

在for循环中的索引变量$i被初始化为1，但是0是数组的第一个元素。同样，您可能希望条件为$i < $no_requests;。我用foreach循环代替了它，这样你就不用担心管理索引了。

<form name="search_form" action="" method="POST">
    <label>
        <span class="label">Town:</span>
        <input type="text" id="search_town" name="search_town" />
    </label><br />
    <br />
    <input class="Send" type="submit" name="search" value="Search" />
</form>
<?php
if(isset($_POST["search"]))
{
    SearchTown();
}
function SearchTown()
{
    $search_town = $_POST["search_town"];
    $no_requests = 2;
    $url = "http://dev.api.ean.com/ean-services/rs/hotel/v3/list?cid=55505&apiKey=r662e63dr8tkvh9ttqjmsev8&locale=en_US&currencyCode=USD&xml=%3CHotelListRequest%3E%3Ccity%3E".$search_town."%3C/city%3E%3CarrivalDate%3E08/01/2014%3C/arrivalDate%3E%3CdepartureDate%3E08/03/2014%3C/departureDate%3E%3CRoomGroup%3E%3CRoom%3E%3CnumberOfAdults%3E2%3C/numberOfAdults%3E%3C/Room%3E%3C/RoomGroup%3E%3CnumberOfResults%3E".$no_requests."%3C/numberOfResults%3E%3CsupplierCacheTolerance%3EMED_ENHANCED%3C/supplierCacheTolerance%3E%3C/HotelListRequest%3E";
    $result = file_get_contents($url);

    $data = json_decode($result);
    // Make sure HotelSummary is an array - a single result does not get an array wrapper in the response.
    if (!is_array($data->HotelListResponse->HotelList->HotelSummary))
        // A simple cast using (array) won't work here - it would convert the HotelSummary object itself rather than wrapping it inside of an array.
        $data->HotelListResponse->HotelList->HotelSummary = array($data->HotelListResponse->HotelList->HotelSummary);
    foreach ($data->HotelListResponse->HotelList->HotelSummary as $i => $hotelSummary)
    {
        echo "{$i}: " . $hotelSummary->name . "<br />";
    }
}

当$no_requests设置为2时，搜索Cleveland，结果为:

0: Cleveland Marriott Downtown at Key Center
1: DoubleTree by Hilton Cleveland Downtown - Lakeside

将$no_requests还原为1后执行相同的搜索，结果为:

0: Cleveland Marriott Downtown at Key Center