使用 Binance Api 和 php 检索 json 中所有市场对的列表时出现问题

Question

我正在尝试使用 foreach 检索 json 中所有市场对的列表。我希望结果是这样的

["BTC","LTC","ETH","NEO","BNB","QTUM","EOS","SNT","BNT","GAS","BCC","USDT","HSR","OAX","DNT","MCO","ICN","ZRX","OMG","WTC","YOYO","LRC","TRX"]

但是如果我使用我的 json_response 函数，我只会得到 BTC 或第一个值，如果我使用 echo 或 print，我会得到一个像 BTCLTCETH 这样的字符串，这意味着它会获取值，但它们只是一个大字符串。这是我的foreach。感谢任何帮助。

代码

$api = new Binance\API($key,$secret);
$exchangeInfo = $api->exchangeInfo();

foreach($exchangeInfo['symbols'] as $info) {
    json_response($info['symbol']);
 
}

json_response 函数

function json_response($data=null, $httpStatus=200)
{
    header_remove();

    header("Content-Type: application/json");

    http_response_code($httpStatus);

    echo json_encode($data);

    exit();
}

一对的 exchangeInfo 函数响应如下所示

{
"timezone": "UTC",
"serverTime": 1565246363776,
 "rateLimits": [
 {
 }
 ],
 "exchangeFilters": [
 ],
 "symbols": [
  {
  "symbol": "ETHBTC",
  "status": "TRADING",
  "baseAsset": "ETH",
  "baseAssetPrecision": 8,
  "quoteAsset": "BTC",
  "quotePrecision": 8, // will be removed in future api versions (v4+)
  "quoteAssetPrecision": 8,
  "baseCommissionPrecision": 8,
  "quoteCommissionPrecision": 8,
  "orderTypes": [
    "LIMIT",
    "LIMIT_MAKER",
    "MARKET",
    "STOP_LOSS",
    "STOP_LOSS_LIMIT",
    "TAKE_PROFIT",
    "TAKE_PROFIT_LIMIT"
  ],
  "icebergAllowed": true,
  "ocoAllowed": true,
  "quoteOrderQtyMarketAllowed": true,
  "isSpotTradingAllowed": true,
  "isMarginTradingAllowed": true,
  "filters": [
    //These are defined in the Filters section.
    //All filters are optional
  ],
  "permissions": [
    "SPOT",
    "MARGIN"
  ]
}
]
}

我需要从中提取所有 'symbol' 值

Answer 1

不要在循环中回显 JSON 字符串 X 次。在循环中构建一个数组，并从构建的数组中回显 JSON String ONCE。

看来您也从数据结构中的错误位置获取数据！

"symbol": "ETHBTC"

这不是您想要的。可能你需要

"baseAsset": "ETH"

and/or

"quoteAsset": "BTC"

$results = [];
foreach($exchangeInfo['symbols'] as $info) {
    $results[] = $info['quoteAsset'];       // or maybe baseAsset or maybe both
 
}
json_response($results);

Also you may want to remove the exit() from your json_response() function. It is a dangerous side effect to have in a function. If you need to exit once its called, put the exit after the call to json_response() but dont assume this will always be the last thing you want to do before terminating the script.

使用 Binance Api 和 php 检索 json 中所有市场对的列表时出现问题

Problem with retrieving a list of all market pairs in json using Binance Api with php

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