如何使用PHP获取和解码JSON数据？

Question

我如何获得变量＆＃34; price_usd＆＃34;和＆＃34; price_btc＆＃34;来自JSON url https://api.coinmarketcap.com/v1/ticker/ethereum/？我写了一个脚本但没有任何反应。

 <?php
$tick = file_get_contents('https://api.coinmarketcap.com/v1/ticker/ethereum/'); 
$url = $tick;
$json = file_get_contents($url);
$data = json_decode($json, TRUE);

$usd = $data[0]["price_usd"];
echo $usd;
?>

Answer 1

你的代码使用了两次file_get_contents，看看会是：

<?php
$tick = file_get_contents('https://api.coinmarketcap.com/v1/ticker/ethereum/');
$url = $tick;
echo $url;
//$json = file_get_contents($url);
$data = json_decode($tick, TRUE);

$usd = $data[0]["price_usd"];
echo $usd;
?>

Answer 2

试试这个

<?php
$json = file_get_contents('https://api.coinmarketcap.com/v1/ticker/ethereum/'); 
$data = json_decode($json);
var_dump($data[0]->price_usd);

?>