PHP将简单的三行JavaScript转换为等效的PHP

我已经得到了几行JavaScript,我需要将它们转换成PHP等价物。我不是一个JavaScript开发人员,我正在努力解决这个问题。以下是我收到的JavaScript示例:

const crypto = require('crypto')
const secret_in_hex = Buffer.from(secret, 'hex');

const hash = crypto.createHmac('sha512', secret_in_hex)
  .update(body)
  .digest('hex')

// Compare hash with the received X-Onfleet-Signature in raw bytes

这个 docs

Each webhook request contains a signature from Onfleet in X-Onfleet-Signature header. To authenticate the webhook request received on your webhook server, you will need to validate against this header. To validate against X-Onfleet-Signature, you will need to compare its value with an HMAC you have generated using the hexadecimal format of your webhook secrets and the full body of the webhook POST request in raw bytes.

我想我会用 hash_hmac 功能和可能的 bin2hex 函数,但在这一点上完全难倒了,如果有人能向我展示上述JavaScript的PHP等价物,我将不胜感激(假设有)。