如何用php获取url的参数传递到api并显示出来?

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$x = $_GET['a'];

$api_url = "https://api.nomics.com/v1/currencies/ticker?key=2018-09-demo-dont-deploy-b69315e440beb145&interval=1d&convert=CNY&ids=" . $x;

$res = file_get_contents($api_url);
echo json_decode($res,true)[0]['price'];
var_dump(json_decode( file_get_contents('https://api.nomics.com/v1/currencies/ticker?key=2018-09-demo-dont-deploy-b69315e440beb145&interval=1d&convert=CNY&ids=' . $_GET['a']))[0]->price);
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