使用 Binance Api 和 php 检索 json 中所有市场对列表的问题

问题描述

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 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，这意味着它获取值，但它们只是一个大字符串。这是我的foreach。任何帮助表示赞赏。

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();
}

exchangeInfo 函数响应看起来像这样一对

{
"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“符号”值

解决方法

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

看起来您也是从数据结构中的错误位置获取数据！

"symbol": "ETHBTC"

不是您想要的。可能你需要

"baseAsset": "ETH"

和/或

"quoteAsset": "BTC"

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

此外，您可能还想从 exit() 函数中删除 json_response()。在函数中具有危险的副作用。如果您需要在调用后退出，请将 exit 放在调用 json_response() 之后，但不要认为这将始终是您在终止脚本之前要做的最后一件事。