Question

为什么我无法用PHP从json文件中获取值？我得到零值？已经试了几个小时。

    <?php


$json_string = 'http://pubapi.cryptsy.com/api.php?method=singlemarketdata&marketid=44';

$jsondata = file_get_contents($json_string);

$data = json_decode($jsondata, TRUE);

print_r($data);

echo "<br><br><br><br>";

foreach ($data as $recenttrades) {
    echo "VALUES('{$recenttrades->quantity}', '{$recenttrades->price}' ";
}


?>

更新：但无法从primaryname和primarycode获取值。

我试过这个：

$json_string = 'http://pubapi.cryptsy.com/api.php?method=marketdatav2';

$jsondata = file_get_contents($json_string);

$data = json_decode($jsondata, TRUE);

//print_r($data);


foreach ($data["market"] as $markets) { 
echo "Primary code: <strong>{$markets['primarycode']}</strong><br>";

  foreach($markets as $market) {
    foreach($market as $attributes) {
      foreach($attributes["recenttrades"] as $recenttrade) {

        echo "quantity: " . $recenttrade['quantity'] .", price: " . $recenttrade['price'] . "<br>";
      }
    }
  }
}

Answer 1

recenttrades嵌套在该数组中。尝试

foreach ($data['return']['markets']['FST']['recenttrades'] as $recenttrades) {

Answer 2

recenttrades是嵌套的几个级别，因此仅仅执行foreach($data as $recenttrades)是不够的。

你需要这样做：

$recentTrades = $data['return']['markets']['FST']['recenttrades'];

foreach($recentTrades as $recentTrade) {
   ...
}

Answer 3

其他人提到你正在处理嵌套数组，而不是对象。除了指出嵌套相当深的问题之外，我建议用foreach进行挖掘（我可能会被钉在十字架上）：

     <?php


$json_string = 'http://pubapi.cryptsy.com/api.php?method=singlemarketdata&marketid=44';

$jsondata = file_get_contents($json_string);

$data = json_decode($jsondata, TRUE);

//print_r($data);

echo "<br><br><br><br>";

foreach ($data as $markets) {
  foreach($markets as $market) {
    foreach($market as $attributes) {
      foreach($attributes["recenttrades"] as $recenttrade) { 
        //echo "<pre>";
        //print_r($recenttrade);
        //echo "</pre>";
        echo "VALUES('{quantity: " . $recenttrade['quantity'] ."}', 'price: {" . $recenttrade['price'] . "}')";
      }
    }
  }
}

＆GT;

这将确保您获取此阵列级别的每个recentrades项目。通过这种方式，您可以将其他市场添加到API中，并且您的代码不会仅锁定在名为＆＃34; FST＆＃34;的项目中。

Answer 4

recenttrades深深嵌套，你要求数组，而不是对象。这似乎有效：

foreach ($data['return']['markets']['FST']['recenttrades'] as $recenttrades) {
    echo "VALUES('{$recenttrades['quantity']}', '{$recenttrades['price']}' ";
}

Answer 5

为了响应您的更新，您希望在市场上进行循环，请尝试以下操作：

foreach ($data['return']['markets'] as $market) {
  echo "Primary code: <strong>{$market['primarycode']}</strong><br>";
  foreach ($market["recenttrades"] as $recenttrade) {
      echo "quantity: " . $recenttrade['quantity'] .", price: " . $recenttrade['price'] . "<br>";
  }
}

json和PHP解析

5 个答案: