通过键名而不是全部从 JSON 中获取特定的键/值

Question

我有显示多个键值对的 JSON。我想循环并创建一个新数组，其中仅包含我想要的键值对以显示它们。这是我的尝试，当然，我的代码正在重写我的数组 ($new_array)，使其只有一个元素。

 //SAMPLE JSON
 [{"PropertyId":"555","FloorplanId":"555","FloorplanName":"Studio","Beds":"0","Baths":"1.00","AvailabilityURL","UnitTypeMapping":".058500"},{"PropertyId":"666","FloorplanId":"666","FloorplanName":"Studio","Beds":"0","Baths":"1.00","AvailabilityURL","UnitTypeMapping":".058500"}]

 //GET ALL JSON FROM URL
 $json = file_get_contents('<URL>');
 $data = json_decode($json);
 // print_r($data); //ALL keys

 //GET JUST THE KEYS I WANT
 $new_array = array("FloorplanName"=>"","Beds"=>"","Baths"=>"");

 // Create new array
 foreach($data as $item) {
   $new_array['FloorplanName'] = $item->{'FloorplanName'};
   $new_array['Beds'] = $item->{'Beds'};
   $new_array['Baths'] = $item->{'Baths'};
 }

 //loop over $new_array
 foreach($new_array as $item) {
   $item->{'FloorplanName'};
   $item->{'Beds'};
   $item->{'Baths'};
 }

Answer 1

现在，您在 $new_array 上设置关联键，并在每次通过 foreach 循环时覆盖您的数据。相反，您需要向$new_array 添加一个项目（子数组）并将数据分配给子数组。

而不是这个：

//GET JUST THE KEYS I WANT
$new_array = array("FloorplanName"=>"","Beds"=>"","Baths"=>"");

// access property of object in array
 foreach($data as $item) {
   $new_array['FloorplanName'] = $item->{'FloorplanName'};
   $new_array['Beds'] = $item->{'Beds'};
   $new_array['Baths'] = $item->{'Baths'};
 }

你需要

$new_array = array(); // this array should be empty

// access property of object in array
foreach($data as $item) {
  $new_array[] = array(
    'FloorplanName' => $item->{'FloorplanName'},
    'Beds' => $item->{'Beds'},
    'Baths' => $item->{'Baths'},
  );
}

另外，要循环遍历新数组，您需要更改最终循环：

//loop over $new_array
foreach($new_array as $item) {
  echo $item['FloorplanName'];
  echo $item['Beds'];
  echo $item['Baths'];
}