PHP的API请求加载速度较慢

Question

我正在使用PHP从多个比特币交易所获取价格数据和交易量数据，但是当您加载页面时，它需要将近20秒。如何改善载入时间？我认为这与卷曲有关。

 <?php
    function getData($url) {
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_URL, $url);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
    $rawData = curl_exec($curl);
    curl_close($curl);
    return json_decode($rawData, true);
    }
    //BTC Volume LocalBitcoins
    $BTCVolumeLocal = getData('https://localbitcoins.com/bitcoinaverage/ticker-all-currencies/');
    $LocalVolume = $BTCVolumeLocal["USD"]["volume_btc"];

    //BTC Volume BTCE
    $BTCVolumeBTCE = getData('https://btc-e.com/api/3/ticker/btc_usd');
    $BTCEVolume = $BTCVolumeBTCE["btc_usd"]["vol_cur"];

    //BTC Volume Bitstamp
    $BTCVolumeStamp = getData('https://www.bitstamp.net/api/ticker/');
    $StampVolume = $BTCVolumeStamp["volume"];

    //BTC Volume Bitfinex
    $BTCVolumeFinex = getData('https://api.bitfinex.com/v1/pubticker/btcusd');
    $FinexVolume = $BTCVolumeFinex["volume"];

    //BTC Volume OKCoin
    $BTCVolumeOK = getData('https://www.okcoin.com/api/ticker.do?ok=1');
    $OKCoinVolume = $BTCVolumeOK["ticker"]["vol"];

    //BTC Volume LakeBTC
    $BTCVolumeLake = getData('https://www.lakebtc.com/api_v1/ticker');
    $LakeVolume = $BTCVolumeLake["USD"]["volume"];

    //Totals the Volumes
    $TotalVolume = $LakeVolume + $FinexVolume + $OKCoinVolume + $StampVolume + $BTCEVolume + $LocalVolume;
    //Percents of Total Volume
    $BTCEPercent = $BTCEVolume / $TotalVolume;
    $StampPercent = $StampVolume / $TotalVolume;
    $FinexPercent = $FinexVolume / $TotalVolume;
    $OKPercent = $OKCoinVolume / $TotalVolume;
    $LakePercent = $LakeVolume / $TotalVolume;
    $LocalPercent = $LocalVolume / $TotalVolume;

    //BTC Price BTCE
    $BTCPriceBTCE = getData('https://btc-e.com/api/3/ticker/btc_usd');
    $BTCEPrice = $BTCPriceBTCE["btc_usd"]["last"];

    //BTC Price Bitstamp
    $BTCPriceStamp = getData('https://www.bitstamp.net/api/ticker/');
    $StampPrice = $BTCPriceStamp["last"];

    //BTC Price Bitfinex
    $BTCPriceFinex = getData('https://api.bitfinex.com/v1/pubticker/btcusd');
    $FinexPrice = $BTCPriceFinex["last_price"];

    //BTC Price OKCoin
    $BTCPriceOK = getData('https://www.okcoin.com/api/ticker.do?ok=1');
    $OKPrice = $BTCPriceOK["ticker"]["last"];

    //BTC Price LakeBTC
    $BTCPriceLake = getData('https://www.lakebtc.com/api_v1/ticker');
    $LakePrice = $BTCPriceLake["USD"]["last"];

    //BTC Price LocalBitcoins
    $BTCPriceLocal = getData('https://localbitcoins.com/bitcoinaverage/ticker-all-currencies/');
    $LocalPrice = $BTCPriceLocal["USD"]["avg_1h"];

    //BTC Price * Percent
    $BTCEPricePercent = $BTCEPrice * $BTCEPercent;
    $StampPricePercent = $StampPrice * $StampPercent;
    $FinexPricePercent = $FinexPrice * $FinexPercent;
    $OKPricePercent = $OKPrice * $OKPercent;
    $LakePricePercent = $LakePrice * $LakePercent;
    $LocalPricePercent = $LocalPrice * $LocalPercent;

    //Bitcoin Price
    $bitcoinPrice = round($LakePricePercent + $OKPricePercent + $FinexPricePercent + $StampPricePercent + $BTCEPricePercent + $LocalPricePercent, 2);

    ?>

Answer 1

如果API的响应速度不够快，并且不受您的控制，您可能将无法更改此设置。

并行查询它们可能会加快速度，但是正如注释中所提到的，使用PHP通常不是那么容易。

如果仅是页面的加载时间，则可以缓存API查询的结果：

• 将API请求放入cronjob，每隔x分钟自动调用一次。根据输入数据的变化速度，该时间可以低至1分钟（不幸的是，这将导致大量流量），或者如果可以进行计算，则可以每小时查询一次。
• 将结果保存到本地数据库或缓存（MySQL，Redis，Memcache等）
• 为了进行计算，仅从值的本地副本中读取，这比每次查询服务都要快得多