Cách lấy giá vàng trực tiếp bằng PHP

export GOLDPRICE_API_KEY=ga_live_replace_with_your_key_here

php -m | grep -E '^(curl|json|bcmath)$'# curl# json# bcmath   <- if missing, install php8.3-bcmath (or enable in php.ini)

<?php// php: goldprice.php, native cURL + BCMath, no Composer// curl-equivalent: https://api.goldprice.dev/v1/spot/XAU-USD-SPOTdeclare(strict_types=1);const API_BASE = 'https://api.goldprice.dev';const TIMEOUT  = 5;   // secondsconst TTL      = 60;  // secondsfinal class RateLimitedException extends RuntimeException {}final class GoldpriceClient{    private string $apiKey;    /** @var array<string, array{data: array, expires: int}> */    private static array $cache = [];    public function __construct()    {        $key = getenv('GOLDPRICE_API_KEY');        if ($key === false || $key === '') {            throw new RuntimeException('GOLDPRICE_API_KEY not set');        }        $this->apiKey = $key;    }    /**     * Fetch live spot price. Cached 60s per symbol, retries 3x on 429.     * Prices stay as strings for BCMath.     */    public function spot(string $symbol = 'XAU-USD-SPOT'): array    {        $now = time();        if (isset(self::$cache[$symbol]) && self::$cache[$symbol]['expires'] > $now) {            return self::$cache[$symbol]['data'];        }        for ($attempt = 0; $attempt < 3; $attempt++) {            try {                $data = $this->fetch($symbol);                self::$cache[$symbol] = ['data' => $data, 'expires' => $now + TTL];                return $data;            } catch (RateLimitedException) {                sleep(1 << $attempt); // 1s, 2s, 4s            }        }        throw new RateLimitedException('goldprice: 429 after 3 retries');    }    private function fetch(string $symbol): array    {        $ch = curl_init(API_BASE . '/v1/spot/' . rawurlencode($symbol));        curl_setopt_array($ch, [            CURLOPT_RETURNTRANSFER => true,            CURLOPT_TIMEOUT        => TIMEOUT,            CURLOPT_HTTPHEADER     => ['X-API-Key: ' . $this->apiKey],        ]);        $body = curl_exec($ch);        $code = curl_getinfo($ch, CURLINFO_RESPONSE_CODE);        curl_close($ch);        if ($code === 429) {            throw new RateLimitedException('rate limited');        }        if ($code !== 200 || $body === false) {            throw new RuntimeException("goldprice: unexpected status {$code}");        }        return json_decode((string) $body, true, 512, JSON_THROW_ON_ERROR);    }}$client = new GoldpriceClient();$r = $client->spot('XAU-USD-SPOT');// Prices are strings; use BCMath for exact math (e.g. price for 5 oz):$fiveOz = bcmul($r['price'], '5', 4);printf("%s-%s: %s (computed %s)\n", $r['symbol'], $r['quote_currency'], $r['price'], $r['computed_at']);printf("5 troy oz = %s %s\n", $fiveOz, $r['quote_currency']);

php goldprice.php# XAU-USD: 4012.75 (computed 2026-10-23T07:00:18.221118+00:00)# 5 troy oz = 20063.7500 USD

$client = new GoldpriceClient();// USD spot, default$client->spot('XAU-USD-SPOT');$client->spot('XAU-INR-SPOT');$client->spot('XAU-EUR-SPOT');// Silver in USD$client->spot('XAG-USD-SPOT');

{  "symbol": "XAU",  "quote_currency": "USD",  "unit": "troy_ounce",  "contract_type": "spot",  "price": "4012.75",  "is_stale": false,  "computed_at": "2026-10-23T07:00:18.221118+00:00"}