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php - 如何使用 PHP 从 API JSON 请求中获取特定数据

问题描述

我是代码新手，我正在尝试使用 PHP 提取某些 JSON API。在这种情况下，它是 ETH_USD。下面是 API 的一个片段。

{"symbol":"ETH_USD","volumen24hours":398.18320159,"ask":235.9,"bid":212.50000001,"lastPrice":213.48283633},{"symbol":"ETH_EUR","volumen24hours":101.79246082," ask":191.51196436,"bid":191.51196436,"lastPrice":191.51196436},{"symbol":"ETH_ARS","volumen24hours":56.42036715,"ask":9365.12240119,"bid":8952,"lastPrice":9365.122410 },

以下是我到目前为止的 php 代码。如何获取 ETH_USD 数据？任何帮助表示赞赏。

<?php

$url = "https://www.website.com/api/ticker?format=json";
$fgc = file_get_contents($ur);
$json = json_decode($fgc, true);

$price = $json["lastPrice"];
$high = $json["ask"];
$low = $json["bid"];
$open = $json["open"];

if($open < $price){
//price went up
    $indicator = "+"
    $change = $price - $open;
    $percent = $change / $open;
    $percent = $percent * 100;
    $percentChange = $indicator.number_format($percent, 2);
    $color = "green";
}
if($open > $price){
//price went down
    $indicator = "-"
    $change = $open - $price;
    $percent = $change / $open;
    $percent = $percent * 100;
    $percentChange = $indicator.number_format($percent, 2);
    $color = "red";
}
?>

标签： phpjson

解决方案

您可以为此目的使用array_filter： 

$json = '[{
    "symbol": "ETH_USD",
    "volumen24hours": 398.18320159,
    "ask": 235.9,
    "bid": 212.50000001,
    "lastPrice": 213.48283633
}, {
    "symbol": "ETH_EUR",
    "volumen24hours": 101.79246082,
    "ask": 191.51196436,
    "bid": 191.51196436,
    "lastPrice": 191.51196436
}, {
    "symbol": "ETH_ARS",
    "volumen24hours": 56.42036715,
    "ask": 9365.12240119,
    "bid": 8952,
    "lastPrice": 9365.12240119
}]';


$new = array_filter(json_decode($json, true), function ($var) {
    return ($var['symbol'] == 'ETH_USD');
});

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