求助一段java代码转php

private static byte[] hmacSHA256(String data, String key) throws Exception {
Mac sha256_HMAC = Mac.getInstance("HmacSHA256");
SecretKeySpec secret_key = new
SecretKeySpec(key.getBytes(StandardCharsets.UTF_8), "HmacSHA256");
sha256_HMAC.init(secret_key);
return sha256_HMAC.doFinal(data.getBytes(StandardCharsets.UTF_8));
}

我网上查了下，说是
$hmac_sha256=hash_hmac(‘sha256’, $sign_content , $key);
但是请java同事跑了一下和我不一样